🕷️ Crawler Inspector

URL Lookup

Direct Parameter Lookup

Raw Queries and Responses

1. Shard Calculation

Query:

Response:

Calculated Shard: 50 (from laksa017)

2. Crawled Status Check

Query:

curl -X POST \
  'http://laksa050.int.ahrefs:8124/' \
  -H 'Content-Type: text/plain' \
  -H 'X-ClickHouse-Database: crawler3' \
  -H 'Authorization: Basic YXBpOg==' \
  -d 'SELECT getAhrefsURLFromUnparsed(src_unparsed) AS found_url, ifNull(toUnixTimestamp(download_stamp), 0) AS crawl_time, ifNull(toUnixTimestamp(props_url_first_seen), 0) AS first_indexed_time, download_http_code AS http_code, src_unparsed AS src_unparsed, src_root_hash AS src_root_hash, history_drop_reason AS history_drop_reason, meta_title AS meta_title, meta_descriptions AS meta_descriptions, attrs_boilerpipe_text AS attrs_boilerpipe_text, attrs_markdown AS attrs_markdown, attrs_readable_markdown AS attrs_readable_markdown, meta_canonical AS meta_canonical, ml_categories_json AS ml_categories_json, ml_types_json AS ml_types_json, ml_intent_types_json AS ml_intent_types_json, meta_language AS meta_language, attrs_author AS attrs_author, ifNull(toUnixTimestamp(attrs_publish_time), 0) AS attrs_publish_time, ifNull(toUnixTimestamp(attrs_original_publish_time), 0) AS attrs_original_publish_time, ifNull(attrs_is_republished, 0) AS attrs_is_republished, ifNull(attrs_nr_words, 0) AS attrs_nr_words, ifNull(attrs_boilerpipe_nr_words, 0) AS attrs_boilerpipe_nr_words, ifNull(body_ext_links_number, 0) AS body_ext_links_number, ifNull(body_int_links_number, 0) AS body_int_links_number, ifNull(meta_nofollow, 0) AS meta_nofollow, ifNull(meta_noarchive, 0) AS meta_noarchive, ifNull(props_was_rendered, 0) AS props_was_rendered, ifNull(src_redirect, \'\') AS src_redirect, ifNull(download_time_msec, 0) AS download_time_msec, ifNull(download_ttfb_msec, 0) AS download_ttfb_msec, ifNull(download_size, 0) AS download_size FROM crawler3.page_info_local FINAL PREWHERE (src_root_hash, src_unparsed) IN ((getAhrefsRootHashFromUnparsed(getAhrefsUnparsedNoserviceFromURL(\'https://www.verywellhealth.com/itchy-rash-on-arms-and-legs-5272152\')), getAhrefsUnparsedNoserviceFromURL(\'https://www.verywellhealth.com/itchy-rash-on-arms-and-legs-5272152\'))) FORMAT JSONEachRow'

Response:

{"found_url":"https:\/\/www.verywellhealth.com\/itchy-rash-on-arms-and-legs-5272152","crawl_time":1776274372,"first_indexed_time":1663721165,"http_code":200,"src_unparsed":"com,verywellhealth!www,\/itchy-rash-on-arms-and-legs-5272152 s443","src_root_hash":"5681562863987870850","history_drop_reason":null,"meta_title":"12 Hidden Causes of Itchy Rashes You Need to Know","meta_descriptions":["Explore 12 common causes of itchy rashes on arms and legs, including allergies and eczema, and learn when to seek medical advice for persistent symptoms."],"attrs_boilerpipe_text":"Key Takeaways\nContact dermatitis, insect bites, and eczema are some common causes of itchy rashes.\nMany skin rashes on the arms or legs are mild and will resolve on their own.\nContact a healthcare provider if a rash does not improve or gets worse.\nAn itchy rash on your arms or legs can be troubling and disruptive, often caused by potential culprits such as contact dermatitis, eczema, or even insect bites. Fortunately, many rashes are mild, resolving on their own, but knowing when to seek medical guidance can save you from discomfort.\nHeikeKampe \/ E+ \/ Getty Images\n1. Contact Dermatitis\nContact dermatitis is a skin response that happens after skin has come into contact with an allergen or irritant. Numerous allergens can cause an allergic reaction to the skin. Some of the most common include:\n1\nNickel\n: Found in some jewelry\nLatex\n: An ingredient in some rubber products\nParaphenylenediamine (PPD)\n:\nAn ingredient in some permanent hair dye\nPoison ivy\n: A low-lying plant found in many areas of the country\nFragrances\n: Perfumes added to cosmetics,\nshampoos\n, and lotions\nA contact dermatitis\nrash\nmay appear 48 hours or more after exposure, especially if triggered by an allergen. Irritants usually cause rashes within minutes to hours.\nSymptoms may include:\n1\nRedness\nSwelling\nItchiness\nBlisters\nFlakiness\nOne of the best ways to determine if a rash on the arms or legs is contact dermatitis is to look at the rash pattern. For example, is there a mark from a watch, or does the rash appear on a part of the body where a certain product was used?\nContact a healthcare provider if there is no clear cause for the rash.\n2. Insect Bites\nVarious insects can cause an itchy rash. You might identify the insect by the rash's appearance. For example,\nflea bites\ncan lead to:\n2\nPain\nItchiness\nSmall raised bumps\nIf you're allergic to flea bites, the rash may be more severe, with blistering and swelling.\nSome fleas carry diseases that can cause serious conditions. Potential conditions that someone can develop after being bitten by a disease-carrying flea include:\n3\nFlea borne\ntyphus\nPlague\nCat scratch disease\n(CSD)\nOther insects that can cause an itchy rash include:\nBed bugs:\nThese bites often appear in a line or cluster.\n4\nChiggers:\nChigger bites are often found in skin folds or parts of the body where clothing fits tightly. They look like bumps, welts, or blisters.\n5\nScabies:\nScabies can cause rash-like lesions.\n6\nBrowntail moths\n:\nThe caterpillars of these moths have hairs that can cause a skin rash when touched. In the United States, browntail moths are found primarily in Maine and Cape Cod, Massachusetts.\n7\n3. Fifth Disease\nFifth disease\nis a viral illness that is also known as parvovirus. It causes a characteristic red rash on the face that appears like a slap. It is most commonly seen in children.\nThere can also be a rash on the arms, legs, chest, and back. However,\nin healthy people, fifth disease tends to be a mild illness that resolves on its own. It is passed on from person to person through respiratory secretions like saliva from a cough or sneeze.\n8\nThe symptoms of a fifth disease rash include:\n8\nRash on the face, arms, or legs\nFever\nHeadache\nStuffy or runny nose\nItching\n4. Eczema (Atopic Dermatitis)\nEczema is a skin condition that can cause an itchy rash, which may range from mild to severe. Eczema can have genetic factors, but it can also be caused by environmental triggers such as weather conditions, allergens, or irritants.\nThe itchy rash may develop anywhere on the body. In the case of an allergen or irritant, the rash develops where the skin came in contact with the triggering substance.\nAn eczema rash has the following\nsymptoms\n:\n9\nItchiness\nSwelling\nRedness\nSmall bumps that can ooze when scratched\nScaly skin patches\n5. Chickenpox\nChickenpox\nis a very contagious condition that causes an itchy red rash that can cover most of the body, including the arms and legs. Caused by the varicella-zoster virus, chickenpox was a common childhood illness until the\nvaccine\nbecame available in 1995.\n10\nThe classic chickenpox rash is red and itchy. The rash will have blisters filled with fluid that eventually scab over. Other\nsymptoms\ncan include fever, fatigue, headache, and decreased appetite.\n10\n6. Drug Allergy\nA\ndrug allergy\nis an immune response to a certain medication. The immune response can be small, only causing a rash, or the response can be significant, causing\nanaphylaxis\n, a life-threatening reaction that causes difficulty breathing and decreased blood pressure.\nAny drug can cause an allergy, but certain ones are more commonly seen:\n11\nPenicillin antibiotics\nSulfonamide antibiotics\nCephalosporins\nAntiseizure medications\nAspirin\nNonsteroidal anti-inflammatory drugs (NSAIDs)\nSymptoms of a drug allergy vary from\nhives\n(an itchy rash) and swelling to difficulty breathing. Whenever a drug allergy is suspected, it's important to contact a healthcare provider.\n7. Chronic Hives\nChronic\nhives\n, medically known as chronic spontaneous urticaria, is a red, raised rash that appears at least twice a week and lasts longer than six weeks.\n12\nChronic hives often have no known cause, but some cases are associated with an autoimmune disorder, thyroid disease, or hormonal issues.\n12\nSymptoms of chronic hives include:\n13\nRaised red welts with pale centers\nItchiness\nSwelling\n8. Heat Rash\nHeat rash is a common skin condition that occurs when sweat blocks the sweat glands. It can occur during hot and humid weather, when you are dressed too warmly for the weather, or when you have a high body temperature.\n14\nHeat rash can look like a cluster of small blisters. It often appears in skin folds such as under the breasts or in the armpits, but it can also appear on the arms or legs in places where clothing is tight.\n14\nHeat rash usually goes away on its own. You can get relief faster by getting out of the heat, drying the sweat from your body, and reducing friction from your clothing or in skin folds.\n9. Poison Ivy, Oak, or Sumac\nPoison ivy, poison oak, and poison sumac are plants in the sumac family. The leaves, stems, roots, and fruits of these plants contain urushiol, a skin irritant that can cause an itchy, blistering rash.\nIf you contact one of these plants, you may be able to wash the urushiol off with lukewarm, soapy water. For best results, this needs to be done right away.\nSome people don't react to urushiol or have only a mild reaction. Other people can develop a more significant reaction that includes large, oozy blisters that crust over. If you have a very severe reaction with difficulty breathing or swallowing, swelling around the face, or a fever, seek emergency medical help right away.\n15\nMilder cases of poison oak, ivy, or sumac can be treated at home with a cool compress, antihistamine medication, and\/or calamine lotion or hydrocortisone cream.\n15\n10. Fungal Infection\nRingworm is a type of fungal infection caused by a group of fungi called dermatophytes. The infection causes an itchy red rash with raised, scaly edges.\nRingworm gets its name from the characteristic ring shape of the rash.\n16\nIt can appear on any part of the body, including the arms and legs, though it is more common in skin folds.\nRingworm is treated with antifungal medication, which can include topical or oral formulations.\nThe fungi that causes a yeast infection (Candida) can also cause an itchy rash anywhere on the body, though it is more common in skin folds such as the armpits.\n11. Molluscum Contagiosum\nMolluscum contagiosum is a rash caused by a virus. It causes pearl-like bumps to appear on the skin and is more common in children. The bumps often appear in clusters and are about 2 to 5 millimeters (mm). They don't usually look red unless they have been rubbed or scratched.\n17\nMolluscum contagiosum can itch, and scratching may cause the virus to spread. The itching can be treated with hydrocortisone cream or ointment.\n18\nHydrocortisone should not be applied directly to molluscum lesions but rather to the surrounding itchy, red skin. Topical corticosteroids can promote the spread of viral skin reactions like molluscum contagiosum.\nMolluscum contagiosum doesn't usually require treatment, although it can take nine months or more for the condition to resolve on its own.\n19\n12. Other Skin Conditions\nOther common skin conditions can cause an itchy rash. Some are chronic, while others will resolve on their own.\nPityriasis rosea\n: This skin condition often occurs after a viral illness. It causes a red, patchy rash that can be itchy. It usually appears on the torso first, but it can spread to the arms.\n20\nPsoriasis\n: This is an autoimmune condition that causes an itchy rash. A psoriasis rash is typically thick and red with silvery scales.\n21\nIf you have a rash that you can't identify that persists for more than a few days or is severe, see a healthcare provider.\nWhen Do You Need to See a Healthcare Provider?\nRashes can be caused by many different conditions. It's important to know when a rash is serious and needs to be assessed by a healthcare provider. Talk to a healthcare provider if a rash follows any of these patterns:\n22\nCovers the body\nComes on suddenly\nSpreads quickly\nAlso, it's important to see a healthcare provider if the following symptoms occur with a rash:\n22\nFever\nDifficulty breathing\n23\nBlisters\nSigns of an infection\nPain\nHow Do Healthcare Providers Diagnose Rashes?\nHealthcare providers can usually diagnose a rash largely based on its appearance and health history.\nIf a healthcare provider cannot determine the cause based on their evaluation, they may order additional testing.\nPatch testing\nis one diagnostic tool used to diagnose some allergies. It is a helpful test when a rash is likely caused by an unknown allergen.\nBlood testing\nis also another tool used to diagnose rashes that may have caused a blood infection, changes in antibodies, or have been caused by an allergy.\nKOH testing\nis done by scraping a small amount of skin and placing it under a microscope to look for an infection. It is a painless procedure.\n24\nSkin biopsy\nis a procedure in which a doctor cuts a piece of skin out for examination under a microscope. In some cases, an itchy rash may be biopsied to rule out a type of skin cancer.\nWhat to Do About Your Itchy Rash\nTreatment for an itchy rash on the arms and legs will depend upon the cause of the rash. One of the first steps to treating the rash is to remove the cause if possible. Once the cause is removed, here are other treatment options:\n25\nAvoid triggers\n: Once the cause of the rash is found, it's important to avoid it. Triggers could be foods, animals, pollen, fragrances, and so much more.\nMoisturizers\n: Itchy rashes can often benefit from moisture. Fragrance-free lotions and creams can seal in moisture and reduce itching.\nHome remedies\n: There are several ways you can manage the symptoms of an itchy rash at home. An\noatmeal bath\nor cold compress can alleviate the itch.\n26\nPrescription medication\n: Certain rashes need prescription medication to clear up. Always follow a healthcare provider's directions on how to use the medication for the best results.\nOver-the-counter (OTC) medication\n:\nOTC medications\ncan be a good choice for mild rashes. Advil (ibuprofen) can reduce pain and swelling. Hydrocortisone cream and calamine lotion are good for relieving itching, and an antihistamine is helpful for itching, redness, and swelling.\nAlways check with a pharmacist or healthcare provider before starting a new medication.","attrs_markdown":"[Skip to content](https:\/\/www.verywellhealth.com\/itchy-rash-on-arms-and-legs-5272152#skip-to-content)\n\nMenu\n\n- [Health A-Z](https:\/\/www.verywellhealth.com\/health-a-z-4014770)\n  - [Colorectal Cancer](https:\/\/www.verywellhealth.com\/colon-cancer-4014742)\n  - [Arthritis](https:\/\/www.verywellhealth.com\/arthritis-overview-4582013)\n  - [Type 2 Diabetes](https:\/\/www.verywellhealth.com\/type-2-diabetes-overview-4581874)\n  - [Digestive Health](https:\/\/www.verywellhealth.com\/digestive-health-4141198)\n  - [Multiple Sclerosis](https:\/\/www.verywellhealth.com\/multiple-sclerosis-overview-4581925)\n  - [Skin Health](https:\/\/www.verywellhealth.com\/skin-health-4014649)\n  - [View All](https:\/\/www.verywellhealth.com\/health-a-z-4014770)\n- [Prevention & Treatment](https:\/\/www.verywellhealth.com\/prevention-and-treatment-4158390)\n  - 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Our website is not intended to be a substitute for professional medical advice, diagnosis, or treatment.\n\nⒸ 2026 People Inc. — All rights reserved\n\n# 12 Hidden Causes of Itchy Rashes You Need to Know\nBy [Patty Weasler, RN, BSN](https:\/\/www.verywellhealth.com\/patty-weasler-5219663)\n\nUpdated on January 28, 2026\n\nMedically reviewed by  [Corinne Savides Happel, MD](https:\/\/www.verywellhealth.com\/corinne-savides-happel-md-4781313)\n\nTable of Contents\n\nView All\n\nTable of Contents\n\n- [Causes](https:\/\/www.verywellhealth.com\/itchy-rash-on-arms-and-legs-5272152#toc-1-contact-dermatitis)\n- [When to Get Help](https:\/\/www.verywellhealth.com\/itchy-rash-on-arms-and-legs-5272152#toc-when-do-you-need-to-see-a-healthcare-provider)\n- [Diagnosis](https:\/\/www.verywellhealth.com\/itchy-rash-on-arms-and-legs-5272152#toc-how-do-healthcare-providers-diagnose-rashes)\n- [Treatment](https:\/\/www.verywellhealth.com\/itchy-rash-on-arms-and-legs-5272152#toc-what-to-do-about-your-itchy-rash)\n\n### Key Takeaways\n- Contact dermatitis, insect bites, and eczema are some common causes of itchy rashes.\n- Many skin rashes on the arms or legs are mild and will resolve on their own.\n\n- Contact a healthcare provider if a rash does not improve or gets worse.\n\nAn itchy rash on your arms or legs can be troubling and disruptive, often caused by potential culprits such as contact dermatitis, eczema, or even insect bites. Fortunately, many rashes are mild, resolving on their own, but knowing when to seek medical guidance can save you from discomfort.\n\n![itchy woman scratching her arm](https:\/\/www.verywellhealth.com\/thmb\/Kah-tfeoq3WEnFzu4iVJVmmFw6E=\/1500x0\/filters:no_upscale\\(\\):max_bytes\\(150000\\):strip_icc\\(\\)\/GettyImages-136359824-57155a8f3df78c3fa225efc9.jpg)\n\n![itchy woman scratching her arm](https:\/\/www.verywellhealth.com\/thmb\/Kah-tfeoq3WEnFzu4iVJVmmFw6E=\/1500x0\/filters:no_upscale\\(\\):max_bytes\\(150000\\):strip_icc\\(\\)\/GettyImages-136359824-57155a8f3df78c3fa225efc9.jpg)\n\nHeikeKampe \/ E+ \/ Getty Images\n## 1\\. Contact Dermatitis\nContact dermatitis is a skin response that happens after skin has come into contact with an allergen or irritant. Numerous allergens can cause an allergic reaction to the skin. Some of the most common include:1\n\n- **Nickel**: Found in some jewelry\n- **Latex**: An ingredient in some rubber products\n- **Paraphenylenediamine (PPD)**:An ingredient in some permanent hair dye\n- **Poison ivy**: A low-lying plant found in many areas of the country\n- **Fragrances**: Perfumes added to cosmetics, [shampoos](https:\/\/www.verywellhealth.com\/allergic-reaction-shampoo-5216076), and lotions\n\nA contact dermatitis [rash](https:\/\/www.verywellhealth.com\/skin-rash-causes-4020286) may appear 48 hours or more after exposure, especially if triggered by an allergen. Irritants usually cause rashes within minutes to hours.\n\nSymptoms may include:1\n\n- Redness\n- Swelling\n- Itchiness\n- Blisters\n- Flakiness\n\nOne of the best ways to determine if a rash on the arms or legs is contact dermatitis is to look at the rash pattern. For example, is there a mark from a watch, or does the rash appear on a part of the body where a certain product was used?\n\nContact a healthcare provider if there is no clear cause for the rash.\n\n## 2\\. Insect Bites\nVarious insects can cause an itchy rash. You might identify the insect by the rash's appearance. For example, [flea bites](https:\/\/www.verywellhealth.com\/bed-bug-bites-vs-flea-bites-7566912) can lead to:2\n\n- Pain\n- Itchiness\n- Small raised bumps\n\nIf you're allergic to flea bites, the rash may be more severe, with blistering and swelling.\n\nSome fleas carry diseases that can cause serious conditions. Potential conditions that someone can develop after being bitten by a disease-carrying flea include:3\n\n- Flea borne [typhus](https:\/\/www.verywellhealth.com\/typhus-5080159)\n- [Plague](https:\/\/www.verywellhealth.com\/seven-things-you-dont-know-about-motion-sickness-1192151)\n- [Cat scratch disease](https:\/\/www.verywellhealth.com\/cat-scratch-fever-overview-and-more-5211722) (CSD)\n\nOther insects that can cause an itchy rash include:\n\n- **Bed bugs:** These bites often appear in a line or cluster.4\n- **Chiggers:** Chigger bites are often found in skin folds or parts of the body where clothing fits tightly. They look like bumps, welts, or blisters.5\n- **Scabies:** Scabies can cause rash-like lesions.6\n- [**Browntail moths**](https:\/\/www.verywellhealth.com\/browntail-moth-rash-8607998)**:** The caterpillars of these moths have hairs that can cause a skin rash when touched. In the United States, browntail moths are found primarily in Maine and Cape Cod, Massachusetts.7\n## 3\\. Fifth Disease\n[Fifth disease](https:\/\/www.verywellhealth.com\/fifth-disease-7553036) is a viral illness that is also known as parvovirus. It causes a characteristic red rash on the face that appears like a slap. It is most commonly seen in children.\n\nThere can also be a rash on the arms, legs, chest, and back. However,in healthy people, fifth disease tends to be a mild illness that resolves on its own. It is passed on from person to person through respiratory secretions like saliva from a cough or sneeze.8\n\nThe symptoms of a fifth disease rash include:8\n\n- Rash on the face, arms, or legs\n- [Fever](https:\/\/www.verywellhealth.com\/fever-8685009)\n- [Headache](https:\/\/www.verywellhealth.com\/vision-and-headache-3422017)\n- Stuffy or runny nose\n- Itching\n## 4\\. Eczema (Atopic Dermatitis)\nEczema is a skin condition that can cause an itchy rash, which may range from mild to severe. Eczema can have genetic factors, but it can also be caused by environmental triggers such as weather conditions, allergens, or irritants.\n\nThe itchy rash may develop anywhere on the body. In the case of an allergen or irritant, the rash develops where the skin came in contact with the triggering substance.\n\nAn eczema rash has the following [symptoms](https:\/\/www.verywellhealth.com\/eczema-symptoms-82717):9\n\n- Itchiness\n- Swelling\n- Redness\n- Small bumps that can ooze when scratched\n- Scaly skin patches\n## 5\\. Chickenpox\n[Chickenpox](https:\/\/www.verywellhealth.com\/chicken-pox-4012865) is a very contagious condition that causes an itchy red rash that can cover most of the body, including the arms and legs. Caused by the varicella-zoster virus, chickenpox was a common childhood illness until the [vaccine](https:\/\/www.verywellhealth.com\/chicken-pox-prevention-vaccine-1068748) became available in 1995.10\n\nThe classic chickenpox rash is red and itchy. The rash will have blisters filled with fluid that eventually scab over. Other [symptoms](https:\/\/www.verywellhealth.com\/symptoms-of-chicken-pox-2634340) can include fever, fatigue, headache, and decreased appetite.10\n\n## 6\\. Drug Allergy\nA [drug allergy](https:\/\/www.verywellhealth.com\/types-of-allergies-5205627) is an immune response to a certain medication. The immune response can be small, only causing a rash, or the response can be significant, causing [anaphylaxis](https:\/\/www.verywellhealth.com\/symptoms-of-anaphylactic-shock-1298253), a life-threatening reaction that causes difficulty breathing and decreased blood pressure.\n\nAny drug can cause an allergy, but certain ones are more commonly seen:11\n\n- Penicillin antibiotics\n- Sulfonamide antibiotics\n- Cephalosporins\n- [Antiseizure medications](https:\/\/www.verywellhealth.com\/anti-epileptic-drugs-4686301)\n- Aspirin\n- [Nonsteroidal anti-inflammatory drugs (NSAIDs)](https:\/\/www.verywellhealth.com\/best-anti-inflammatory-medication-2548734)\n\nSymptoms of a drug allergy vary from [hives](https:\/\/www.verywellhealth.com\/urticaria-signs-symptoms-1069422) (an itchy rash) and swelling to difficulty breathing. Whenever a drug allergy is suspected, it's important to contact a healthcare provider.\n\n## 7\\. Chronic Hives\nChronic [hives](https:\/\/www.verywellhealth.com\/urticaria-signs-symptoms-1069422), medically known as chronic spontaneous urticaria, is a red, raised rash that appears at least twice a week and lasts longer than six weeks.12\n\nChronic hives often have no known cause, but some cases are associated with an autoimmune disorder, thyroid disease, or hormonal issues.12\n\nSymptoms of chronic hives include:13\n\n- Raised red welts with pale centers\n- Itchiness\n- Swelling\n## 8\\. Heat Rash\nHeat rash is a common skin condition that occurs when sweat blocks the sweat glands. It can occur during hot and humid weather, when you are dressed too warmly for the weather, or when you have a high body temperature.14\n\nHeat rash can look like a cluster of small blisters. It often appears in skin folds such as under the breasts or in the armpits, but it can also appear on the arms or legs in places where clothing is tight.14\n\nHeat rash usually goes away on its own. You can get relief faster by getting out of the heat, drying the sweat from your body, and reducing friction from your clothing or in skin folds.\n\n## 9\\. Poison Ivy, Oak, or Sumac\nPoison ivy, poison oak, and poison sumac are plants in the sumac family. The leaves, stems, roots, and fruits of these plants contain urushiol, a skin irritant that can cause an itchy, blistering rash.\n\nIf you contact one of these plants, you may be able to wash the urushiol off with lukewarm, soapy water. For best results, this needs to be done right away.\n\nSome people don't react to urushiol or have only a mild reaction. Other people can develop a more significant reaction that includes large, oozy blisters that crust over. If you have a very severe reaction with difficulty breathing or swallowing, swelling around the face, or a fever, seek emergency medical help right away.15\n\nMilder cases of poison oak, ivy, or sumac can be treated at home with a cool compress, antihistamine medication, and\/or calamine lotion or hydrocortisone cream.15\n\n## 10\\. Fungal Infection\nRingworm is a type of fungal infection caused by a group of fungi called dermatophytes. The infection causes an itchy red rash with raised, scaly edges.\n\nRingworm gets its name from the characteristic ring shape of the rash.16 It can appear on any part of the body, including the arms and legs, though it is more common in skin folds.\n\nRingworm is treated with antifungal medication, which can include topical or oral formulations.\n\nThe fungi that causes a yeast infection (Candida) can also cause an itchy rash anywhere on the body, though it is more common in skin folds such as the armpits.\n\n## 11\\. Molluscum Contagiosum\nMolluscum contagiosum is a rash caused by a virus. It causes pearl-like bumps to appear on the skin and is more common in children. The bumps often appear in clusters and are about 2 to 5 millimeters (mm). They don't usually look red unless they have been rubbed or scratched.17\n\nMolluscum contagiosum can itch, and scratching may cause the virus to spread. The itching can be treated with hydrocortisone cream or ointment.18 Hydrocortisone should not be applied directly to molluscum lesions but rather to the surrounding itchy, red skin. Topical corticosteroids can promote the spread of viral skin reactions like molluscum contagiosum.\n\nMolluscum contagiosum doesn't usually require treatment, although it can take nine months or more for the condition to resolve on its own.19\n\n## 12\\. Other Skin Conditions\nOther common skin conditions can cause an itchy rash. Some are chronic, while others will resolve on their own.\n\n- [**Pityriasis rosea**](https:\/\/www.verywellhealth.com\/pityriasis-rosea-pictures-4020316): This skin condition often occurs after a viral illness. It causes a red, patchy rash that can be itchy. It usually appears on the torso first, but it can spread to the arms.20\n- [Psoriasis](https:\/\/www.verywellhealth.com\/psoriasis-7099867): This is an autoimmune condition that causes an itchy rash. A psoriasis rash is typically thick and red with silvery scales.21\n\nIf you have a rash that you can't identify that persists for more than a few days or is severe, see a healthcare provider.\n\n## When Do You Need to See a Healthcare Provider?\nRashes can be caused by many different conditions. It's important to know when a rash is serious and needs to be assessed by a healthcare provider. Talk to a healthcare provider if a rash follows any of these patterns:22\n\n- Covers the body\n- Comes on suddenly\n- Spreads quickly\n\nAlso, it's important to see a healthcare provider if the following symptoms occur with a rash:22\n\n- [Fever](https:\/\/www.verywellhealth.com\/fever-8685009)\n- [Difficulty breathing](https:\/\/www.verywellhealth.com\/symptoms-of-anaphylactic-shock-1298253)23\n- [Blisters](https:\/\/www.verywellhealth.com\/rashes-with-blisters-1069592)\n- [Signs of an infection](https:\/\/www.verywellhealth.com\/infection-symptoms-5185799)\n- Pain\n## How Do Healthcare Providers Diagnose Rashes?\nHealthcare providers can usually diagnose a rash largely based on its appearance and health history.\n\nIf a healthcare provider cannot determine the cause based on their evaluation, they may order additional testing.\n\n- [**Patch testing**](https:\/\/www.verywellhealth.com\/patch-testing-for-contact-dermatitis-82758) is one diagnostic tool used to diagnose some allergies. It is a helpful test when a rash is likely caused by an unknown allergen.\n- **Blood testing** is also another tool used to diagnose rashes that may have caused a blood infection, changes in antibodies, or have been caused by an allergy.\n- [**KOH testing**](https:\/\/www.verywellhealth.com\/tinea-versicolor-8576648) is done by scraping a small amount of skin and placing it under a microscope to look for an infection. It is a painless procedure.24\n- **Skin biopsy** is a procedure in which a doctor cuts a piece of skin out for examination under a microscope. In some cases, an itchy rash may be biopsied to rule out a type of skin cancer.\n## What to Do About Your Itchy Rash\nTreatment for an itchy rash on the arms and legs will depend upon the cause of the rash. One of the first steps to treating the rash is to remove the cause if possible. Once the cause is removed, here are other treatment options:25\n\n- **Avoid triggers**: Once the cause of the rash is found, it's important to avoid it. Triggers could be foods, animals, pollen, fragrances, and so much more.\n- **Moisturizers**: Itchy rashes can often benefit from moisture. Fragrance-free lotions and creams can seal in moisture and reduce itching.\n- **Home remedies**: There are several ways you can manage the symptoms of an itchy rash at home. An [oatmeal bath](https:\/\/www.verywellhealth.com\/oatmeal-bath-for-rash-8647090) or cold compress can alleviate the itch.26\n- **Prescription medication**: Certain rashes need prescription medication to clear up. Always follow a healthcare provider's directions on how to use the medication for the best results.\n- **Over-the-counter (OTC) medication**: [OTC medications](https:\/\/www.verywellhealth.com\/over-the-counter-cold-and-flu-medications-770618) can be a good choice for mild rashes. Advil (ibuprofen) can reduce pain and swelling. Hydrocortisone cream and calamine lotion are good for relieving itching, and an antihistamine is helpful for itching, redness, and swelling.\n\nAlways check with a pharmacist or healthcare provider before starting a new medication.\n\nRead more:\n\n- [Health A-Z](https:\/\/www.verywellhealth.com\/health-a-z-4014770)\n- [Skin Health](https:\/\/www.verywellhealth.com\/skin-health-4014649)\n\n26 Sources\n\nVerywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our [editorial process](https:\/\/www.verywellhealth.com\/verywell-editorial-process-4777042) to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.\n\n1. Johns Hopkins Medicine. [Contact dermatitis](https:\/\/www.hopkinsmedicine.org\/health\/conditions-and-diseases\/contact-dermatitis).\n2. Johns Hopkins Medicine. [Fleas, mites, and chiggers](https:\/\/www.hopkinsmedicine.org\/health\/conditions-and-diseases\/fleas-mites-and-chiggers).\n3. Centers for Disease Control and Prevention. [About fleas](https:\/\/www.cdc.gov\/fleas\/about\/).\n4. National Library of Medicine. [Bed bugs](https:\/\/medlineplus.gov\/bedbugs.html).\n5. National Library of Medicine. [Chiggers](https:\/\/medlineplus.gov\/ency\/article\/001333.htm).\n6. National Library of Medicine. [Insect bites and stings](https:\/\/medlineplus.gov\/ency\/article\/000033.htm).\n7. Maine.gov Division of Disease Surveillance. [Browntail moths](https:\/\/www.maine.gov\/dhhs\/mecdc\/infectious-disease\/epi\/vector-borne\/browntail-moth\/index.shtml).\n8. Centers for Disease Control and Prevention. [About parvovirus B19](https:\/\/www.cdc.gov\/parvovirus-b19\/about\/index.html).\n9. Johns Hopkins Medicine. [Eczema](https:\/\/www.hopkinsmedicine.org\/health\/conditions-and-diseases\/eczema).\n10. Centers for Disease Control and Prevention. [Chickenpox (varicella)](https:\/\/www.cdc.gov\/chickenpox\/).\n11. American College of Allergy, Asthma, & Immunology. [Drug allergies](https:\/\/acaai.org\/allergies\/allergic-conditions\/drug-allergies\/).\n12. American College of Allergy, Asthma & Immunology. [Chronic spontaneous\/idiopathic urticaria (chronic hives)](https:\/\/acaai.org\/allergies\/allergic-conditions\/skin-allergy\/chronic-hives\/).\n13. Kanani A, Betschel SD, Warrington R. [Urticaria and angioedema](https:\/\/doi.org\/10.1186\/s13223-018-0288-z). *Allergy Asthma Clin Immunol*. 2018;14(2):59. doi:10.1186\/s13223-018-0288-z\n14. American Academy of Family Physicians. [Heat rash](https:\/\/familydoctor.org\/condition\/heat-rash\/?adfree=true).\n15. American Academy of Dermatology Association. [Poison ivy, oak, and sumac: How to treat the rash](https:\/\/www.aad.org\/public\/everyday-care\/itchy-skin\/poison-ivy\/treat-rash).\n16. Johns Hopkins Medicine. [Tinea infections (ringworm)](https:\/\/www.hopkinsmedicine.org\/health\/conditions-and-diseases\/tinea-infections-ringworm).\n17. National Library of Medicine. [Molluscum contagiosum](https:\/\/medlineplus.gov\/ency\/article\/000826.htm).\n18. American Academy of Dermatology Association. [Molluscum contagiosum: Tips for managing](https:\/\/www.aad.org\/public\/diseases\/a-z\/molluscum-contagiosum-tips).\n19. American Academy of Dermatology Association. [Molluscum contagiosum: Diagnosis and treatment](https:\/\/www.aad.org\/public\/diseases\/a-z\/molluscum-contagiosum-treatment).\n20. American Academy of Dermatology Association. [Pityriasis rosea: FAQs](https:\/\/www.aad.org\/public\/diseases\/a-z\/pityriasis-rosea-overview).\n21. National Library of Medicine. [Psoriasis](https:\/\/medlineplus.gov\/psoriasis.html).\n22. American Academy of Dermatology Association. [Rash 101 in adults](https:\/\/www.aad.org\/public\/everyday-care\/itchy-skin\/rash\/rash-101).\n23. Fischer D, Vander Leek TK, Ellis AK, Kim H. [Anaphylaxis](https:\/\/doi.org\/10.1186\/s13223-018-0283-4). *Allergy Asthma Clin Immunol*. 2018;14(2):54. doi:10.1186\/s13223-018-0283-4\n24. Mohanty A, Gupta P, Arathi K, et al. [Evaluation of direct examination, culture, and histopathology in the diagnosis of mucormycosis: Reiterating the role of KOH mount for early diagnosis](https:\/\/doi.org\/10.7759\/cureus.19455). *Cureus*. 2021 Nov;13(11):e19455. doi:10.7759\/cureus.19455\n25. Nowak D, Yeung J. [Diagnosis and treatment of pruritus](https:\/\/pubmed.ncbi.nlm.nih.gov\/29237630\/). *Can Fam Physician*. 2017;63(12):918-924.\n26. Johns Hopkins Medicine. [Poison ivy](https:\/\/www.hopkinsmedicine.org\/health\/conditions-and-diseases\/poison-ivy--poison-oak).\n\n![Patty Weasler](https:\/\/www.verywellhealth.com\/thmb\/hUYj-cI8BMz9t3kSJscXQPrfl80=\/144x144\/filters:no_upscale\\(\\):max_bytes\\(150000\\):strip_icc\\(\\)\/PattyWeaslerbiopicverywell-8c11095ed0114702838c9bbd00aa1485.jpg)\n\n![Patty Weasler](https:\/\/www.verywellhealth.com\/thmb\/hUYj-cI8BMz9t3kSJscXQPrfl80=\/144x144\/filters:no_upscale\\(\\):max_bytes\\(150000\\):strip_icc\\(\\)\/PattyWeaslerbiopicverywell-8c11095ed0114702838c9bbd00aa1485.jpg)\n\nBy [Patty Weasler, RN, BSN](https:\/\/www.verywellhealth.com\/patty-weasler-5219663)   \n Weasler is a Wisconsin-based registered nurse with over a decade of experience in pediatric critical care.\n\n[See Our Editorial Process](https:\/\/www.verywellhealth.com\/verywell-editorial-process-4777042)\n\n[Meet Our Medical Expert Board](https:\/\/www.verywellhealth.com\/meet-our-medical-expert-board-11762003)\n\nShare Feedback\n\nWas 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(Aquagenic Urticaria)](https:\/\/www.verywellhealth.com\/aquagenic-urticaria-11689903)\n\n[![woman washing her face with apple cider vinegar for skin benefits]() ![woman washing her face with apple cider vinegar for skin benefits](https:\/\/www.verywellhealth.com\/thmb\/Vvo-Vz-9B18rrssHhOdOY1zbrtY=\/400x250\/filters:no_upscale\\(\\):max_bytes\\(150000\\):strip_icc\\(\\)\/GettyImages-1143033799-d0ca787ddd3642beb1e4dd0e3e55114b.jpg) 9 Science-Backed Apple Cider Vinegar Skin Benefits](https:\/\/www.verywellhealth.com\/apple-cider-vinegar-skin-benefits-8715739)\n\n[![A Black man itching his arm.]() ![A Black man itching his arm.](https:\/\/www.verywellhealth.com\/thmb\/rOLf83gOdDVienswq7C-KBn8yW8=\/400x250\/filters:no_upscale\\(\\):max_bytes\\(150000\\):strip_icc\\(\\)\/GettyImages-1344781506-75ee731e6cfb441cab2473f8902c0f7c.jpg) What Does Scabies Look Like on Black Skin?](https:\/\/www.verywellhealth.com\/scabies-rash-on-black-skin-6504361)\n\n[![teenage girl looking at herself in the mirror cleaning her face]() ![teenage girl looking at herself in the mirror cleaning her face](https:\/\/www.verywellhealth.com\/thmb\/Iwn5YVXW-Dxn10lXsPtPD8ics9w=\/400x250\/filters:no_upscale\\(\\):max_bytes\\(150000\\):strip_icc\\(\\)\/GettyImages-530683910-579921de3df78c3276e1715d.jpg) Benzoyl Peroxide Side Effects](https:\/\/www.verywellhealth.com\/what-are-benzoyl-peroxide-side-effects-15953)\n\n[![An Asian girl looks at severe acne on her cheek in a compact mirror.]() ![An Asian girl looks at severe acne on her cheek in a compact mirror.](https:\/\/www.verywellhealth.com\/thmb\/ZOCYKJhWj1AVd2gpJNmdpGNun8g=\/400x250\/filters:no_upscale\\(\\):max_bytes\\(150000\\):strip_icc\\(\\)\/severeacne-270cd4142dbe4449b60727045b706828.jpg) Should You Consider Accutane for Severe Acne?](https:\/\/www.verywellhealth.com\/accutane-for-acne-2633108)\n\n[![Woman applying lotion to face]() ![Woman applying lotion to face](https:\/\/www.verywellhealth.com\/thmb\/xNMblmggQ54eaITaYEO3n4rVC4U=\/400x250\/filters:no_upscale\\(\\):max_bytes\\(150000\\):strip_icc\\(\\)\/GettyImages-109765713web-57051bee5f9b581408bfbb53.jpg) The Difference Between Retin-A and Retin-A Micro](https:\/\/www.verywellhealth.com\/difference-between-retin-a-and-retin-a-micro-15872)\n\n[![Managing nodular acne]() ![Managing nodular acne](https:\/\/www.verywellhealth.com\/thmb\/yp1l11v1gVVFCIKk2gKQqtv8JFY=\/400x250\/filters:no_upscale\\(\\):max_bytes\\(150000\\):strip_icc\\(\\)\/nodular-acne-15817_FINAL-5c5db71fc9e77c0001566700.png) What Nodular Acne Looks Like and How It's Treated](https:\/\/www.verywellhealth.com\/nodular-acne-15817)\n\n[![Wild parsnip]() ![Wild parsnip](https:\/\/www.verywellhealth.com\/thmb\/F3rp5LEnYggXObPDb03E5wvlCOo=\/400x250\/filters:no_upscale\\(\\):max_bytes\\(150000\\):strip_icc\\(\\)\/GettyImages-1579001822-712277c17c6340b99c059bc5da129ff1.jpg) Wild Parsnip Burns: Everything You Need to Know](https:\/\/www.verywellhealth.com\/wild-parsnip-burns-8603019)\n\n[![Man checking his moles]() ![Man checking his moles](https:\/\/www.verywellhealth.com\/thmb\/4DN6_g9b1BZLm5dw3vC7uZazExQ=\/400x250\/filters:no_upscale\\(\\):max_bytes\\(150000\\):strip_icc\\(\\)\/GettyImages-1203970577-d08cca115aa944cd9aec8ecab37b2fe9.jpg) Non-Blanching Rash: Causes and When to Call a Healthcare Provider](https:\/\/www.verywellhealth.com\/non-blanching-rash-8634429)\n\n- [Health A-Z](https:\/\/www.verywellhealth.com\/health-a-z-4014770)\n- [Prevention & Treatment](https:\/\/www.verywellhealth.com\/prevention-and-treatment-4158390)\n- [Health Care](https:\/\/www.verywellhealth.com\/health-care-4014769)\n- [News](https:\/\/www.verywellhealth.com\/news-4846412)\n\n- [Meet Our Review Board](https:\/\/www.verywellhealth.com\/meet-our-medical-expert-board-11762003)\n- [About Us](https:\/\/www.verywellhealth.com\/about-us-5180305)\n- [Editorial Process](https:\/\/www.verywellhealth.com\/verywell-editorial-process-4777042)\n- [Privacy Policy](https:\/\/www.people.inc\/brands-privacy)\n- [In the News](https:\/\/www.verywellhealth.com\/in-the-news-4778971)\n- [Advertise](https:\/\/www.people.inc\/advertising)\n- [Terms of Service](https:\/\/www.people.inc\/brands-termsofservice)\n- [Careers](https:\/\/www.people.inc\/careers)\n- [Contact](https:\/\/www.verywellhealth.com\/about-us-5180305#toc-contact-us)\n\nFollow Us\n\nVerywell Health's content is for informational and educational purposes only. Our website is not intended to be a substitute for professional medical advice, diagnosis, or treatment.\n\nⒸ 2026 People Inc. — All rights reserved\n\nVerywell Health is part of the [People Inc.](https:\/\/www.people.inc\/) publishing family.\n\n![]()","attrs_readable_markdown":"### Key Takeaways\n- Contact dermatitis, insect bites, and eczema are some common causes of itchy rashes.\n- Many skin rashes on the arms or legs are mild and will resolve on their own.\n\n- Contact a healthcare provider if a rash does not improve or gets worse.\n\nAn itchy rash on your arms or legs can be troubling and disruptive, often caused by potential culprits such as contact dermatitis, eczema, or even insect bites. Fortunately, many rashes are mild, resolving on their own, but knowing when to seek medical guidance can save you from discomfort.\n\nHeikeKampe \/ E+ \/ Getty Images\n\n## 1\\. Contact Dermatitis\nContact dermatitis is a skin response that happens after skin has come into contact with an allergen or irritant. Numerous allergens can cause an allergic reaction to the skin. Some of the most common include:1\n\n- **Nickel**: Found in some jewelry\n- **Latex**: An ingredient in some rubber products\n- **Paraphenylenediamine (PPD)**:An ingredient in some permanent hair dye\n- **Poison ivy**: A low-lying plant found in many areas of the country\n- **Fragrances**: Perfumes added to cosmetics, [shampoos](https:\/\/www.verywellhealth.com\/allergic-reaction-shampoo-5216076), and lotions\n\nA contact dermatitis [rash](https:\/\/www.verywellhealth.com\/skin-rash-causes-4020286) may appear 48 hours or more after exposure, especially if triggered by an allergen. Irritants usually cause rashes within minutes to hours.\n\nSymptoms may include:1\n\n- Redness\n- Swelling\n- Itchiness\n- Blisters\n- Flakiness\n\nOne of the best ways to determine if a rash on the arms or legs is contact dermatitis is to look at the rash pattern. For example, is there a mark from a watch, or does the rash appear on a part of the body where a certain product was used?\n\nContact a healthcare provider if there is no clear cause for the rash.\n\n## 2\\. Insect Bites\nVarious insects can cause an itchy rash. You might identify the insect by the rash's appearance. For example, [flea bites](https:\/\/www.verywellhealth.com\/bed-bug-bites-vs-flea-bites-7566912) can lead to:2\n\n- Pain\n- Itchiness\n- Small raised bumps\n\nIf you're allergic to flea bites, the rash may be more severe, with blistering and swelling.\n\nSome fleas carry diseases that can cause serious conditions. Potential conditions that someone can develop after being bitten by a disease-carrying flea include:3\n\n- Flea borne [typhus](https:\/\/www.verywellhealth.com\/typhus-5080159)\n- [Plague](https:\/\/www.verywellhealth.com\/seven-things-you-dont-know-about-motion-sickness-1192151)\n- [Cat scratch disease](https:\/\/www.verywellhealth.com\/cat-scratch-fever-overview-and-more-5211722) (CSD)\n\nOther insects that can cause an itchy rash include:\n\n- **Bed bugs:** These bites often appear in a line or cluster.4\n- **Chiggers:** Chigger bites are often found in skin folds or parts of the body where clothing fits tightly. They look like bumps, welts, or blisters.5\n- **Scabies:** Scabies can cause rash-like lesions.6\n- [**Browntail moths**](https:\/\/www.verywellhealth.com\/browntail-moth-rash-8607998)**:** The caterpillars of these moths have hairs that can cause a skin rash when touched. In the United States, browntail moths are found primarily in Maine and Cape Cod, Massachusetts.7\n## 3\\. Fifth Disease\n[Fifth disease](https:\/\/www.verywellhealth.com\/fifth-disease-7553036) is a viral illness that is also known as parvovirus. It causes a characteristic red rash on the face that appears like a slap. It is most commonly seen in children.\n\nThere can also be a rash on the arms, legs, chest, and back. However,in healthy people, fifth disease tends to be a mild illness that resolves on its own. It is passed on from person to person through respiratory secretions like saliva from a cough or sneeze.8\n\nThe symptoms of a fifth disease rash include:8\n\n- Rash on the face, arms, or legs\n- [Fever](https:\/\/www.verywellhealth.com\/fever-8685009)\n- [Headache](https:\/\/www.verywellhealth.com\/vision-and-headache-3422017)\n- Stuffy or runny nose\n- Itching\n## 4\\. Eczema (Atopic Dermatitis)\nEczema is a skin condition that can cause an itchy rash, which may range from mild to severe. Eczema can have genetic factors, but it can also be caused by environmental triggers such as weather conditions, allergens, or irritants.\n\nThe itchy rash may develop anywhere on the body. In the case of an allergen or irritant, the rash develops where the skin came in contact with the triggering substance.\n\nAn eczema rash has the following [symptoms](https:\/\/www.verywellhealth.com\/eczema-symptoms-82717):9\n\n- Itchiness\n- Swelling\n- Redness\n- Small bumps that can ooze when scratched\n- Scaly skin patches\n## 5\\. Chickenpox\n[Chickenpox](https:\/\/www.verywellhealth.com\/chicken-pox-4012865) is a very contagious condition that causes an itchy red rash that can cover most of the body, including the arms and legs. Caused by the varicella-zoster virus, chickenpox was a common childhood illness until the [vaccine](https:\/\/www.verywellhealth.com\/chicken-pox-prevention-vaccine-1068748) became available in 1995.10\n\nThe classic chickenpox rash is red and itchy. The rash will have blisters filled with fluid that eventually scab over. Other [symptoms](https:\/\/www.verywellhealth.com\/symptoms-of-chicken-pox-2634340) can include fever, fatigue, headache, and decreased appetite.10\n\n## 6\\. Drug Allergy\nA [drug allergy](https:\/\/www.verywellhealth.com\/types-of-allergies-5205627) is an immune response to a certain medication. The immune response can be small, only causing a rash, or the response can be significant, causing [anaphylaxis](https:\/\/www.verywellhealth.com\/symptoms-of-anaphylactic-shock-1298253), a life-threatening reaction that causes difficulty breathing and decreased blood pressure.\n\nAny drug can cause an allergy, but certain ones are more commonly seen:11\n\n- Penicillin antibiotics\n- Sulfonamide antibiotics\n- Cephalosporins\n- [Antiseizure medications](https:\/\/www.verywellhealth.com\/anti-epileptic-drugs-4686301)\n- Aspirin\n- [Nonsteroidal anti-inflammatory drugs (NSAIDs)](https:\/\/www.verywellhealth.com\/best-anti-inflammatory-medication-2548734)\n\nSymptoms of a drug allergy vary from [hives](https:\/\/www.verywellhealth.com\/urticaria-signs-symptoms-1069422) (an itchy rash) and swelling to difficulty breathing. Whenever a drug allergy is suspected, it's important to contact a healthcare provider.\n\n## 7\\. Chronic Hives\nChronic [hives](https:\/\/www.verywellhealth.com\/urticaria-signs-symptoms-1069422), medically known as chronic spontaneous urticaria, is a red, raised rash that appears at least twice a week and lasts longer than six weeks.12\n\nChronic hives often have no known cause, but some cases are associated with an autoimmune disorder, thyroid disease, or hormonal issues.12\n\nSymptoms of chronic hives include:13\n\n- Raised red welts with pale centers\n- Itchiness\n- Swelling\n## 8\\. Heat Rash\nHeat rash is a common skin condition that occurs when sweat blocks the sweat glands. It can occur during hot and humid weather, when you are dressed too warmly for the weather, or when you have a high body temperature.14\n\nHeat rash can look like a cluster of small blisters. It often appears in skin folds such as under the breasts or in the armpits, but it can also appear on the arms or legs in places where clothing is tight.14\n\nHeat rash usually goes away on its own. You can get relief faster by getting out of the heat, drying the sweat from your body, and reducing friction from your clothing or in skin folds.\n\n## 9\\. Poison Ivy, Oak, or Sumac\nPoison ivy, poison oak, and poison sumac are plants in the sumac family. The leaves, stems, roots, and fruits of these plants contain urushiol, a skin irritant that can cause an itchy, blistering rash.\n\nIf you contact one of these plants, you may be able to wash the urushiol off with lukewarm, soapy water. For best results, this needs to be done right away.\n\nSome people don't react to urushiol or have only a mild reaction. Other people can develop a more significant reaction that includes large, oozy blisters that crust over. If you have a very severe reaction with difficulty breathing or swallowing, swelling around the face, or a fever, seek emergency medical help right away.15\n\nMilder cases of poison oak, ivy, or sumac can be treated at home with a cool compress, antihistamine medication, and\/or calamine lotion or hydrocortisone cream.15\n\n## 10\\. Fungal Infection\nRingworm is a type of fungal infection caused by a group of fungi called dermatophytes. The infection causes an itchy red rash with raised, scaly edges.\n\nRingworm gets its name from the characteristic ring shape of the rash.16 It can appear on any part of the body, including the arms and legs, though it is more common in skin folds.\n\nRingworm is treated with antifungal medication, which can include topical or oral formulations.\n\nThe fungi that causes a yeast infection (Candida) can also cause an itchy rash anywhere on the body, though it is more common in skin folds such as the armpits.\n\n## 11\\. Molluscum Contagiosum\nMolluscum contagiosum is a rash caused by a virus. It causes pearl-like bumps to appear on the skin and is more common in children. The bumps often appear in clusters and are about 2 to 5 millimeters (mm). They don't usually look red unless they have been rubbed or scratched.17\n\nMolluscum contagiosum can itch, and scratching may cause the virus to spread. The itching can be treated with hydrocortisone cream or ointment.18 Hydrocortisone should not be applied directly to molluscum lesions but rather to the surrounding itchy, red skin. Topical corticosteroids can promote the spread of viral skin reactions like molluscum contagiosum.\n\nMolluscum contagiosum doesn't usually require treatment, although it can take nine months or more for the condition to resolve on its own.19\n\n## 12\\. Other Skin Conditions\nOther common skin conditions can cause an itchy rash. Some are chronic, while others will resolve on their own.\n\n- [**Pityriasis rosea**](https:\/\/www.verywellhealth.com\/pityriasis-rosea-pictures-4020316): This skin condition often occurs after a viral illness. It causes a red, patchy rash that can be itchy. It usually appears on the torso first, but it can spread to the arms.20\n- [Psoriasis](https:\/\/www.verywellhealth.com\/psoriasis-7099867): This is an autoimmune condition that causes an itchy rash. A psoriasis rash is typically thick and red with silvery scales.21\n\nIf you have a rash that you can't identify that persists for more than a few days or is severe, see a healthcare provider.\n\n## When Do You Need to See a Healthcare Provider?\nRashes can be caused by many different conditions. It's important to know when a rash is serious and needs to be assessed by a healthcare provider. Talk to a healthcare provider if a rash follows any of these patterns:22\n\n- Covers the body\n- Comes on suddenly\n- Spreads quickly\n\nAlso, it's important to see a healthcare provider if the following symptoms occur with a rash:22\n\n- [Fever](https:\/\/www.verywellhealth.com\/fever-8685009)\n- [Difficulty breathing](https:\/\/www.verywellhealth.com\/symptoms-of-anaphylactic-shock-1298253)23\n- [Blisters](https:\/\/www.verywellhealth.com\/rashes-with-blisters-1069592)\n- [Signs of an infection](https:\/\/www.verywellhealth.com\/infection-symptoms-5185799)\n- Pain\n## How Do Healthcare Providers Diagnose Rashes?\nHealthcare providers can usually diagnose a rash largely based on its appearance and health history.\n\nIf a healthcare provider cannot determine the cause based on their evaluation, they may order additional testing.\n\n- [**Patch testing**](https:\/\/www.verywellhealth.com\/patch-testing-for-contact-dermatitis-82758) is one diagnostic tool used to diagnose some allergies. It is a helpful test when a rash is likely caused by an unknown allergen.\n- **Blood testing** is also another tool used to diagnose rashes that may have caused a blood infection, changes in antibodies, or have been caused by an allergy.\n- [**KOH testing**](https:\/\/www.verywellhealth.com\/tinea-versicolor-8576648) is done by scraping a small amount of skin and placing it under a microscope to look for an infection. It is a painless procedure.24\n- **Skin biopsy** is a procedure in which a doctor cuts a piece of skin out for examination under a microscope. In some cases, an itchy rash may be biopsied to rule out a type of skin cancer.\n## What to Do About Your Itchy Rash\nTreatment for an itchy rash on the arms and legs will depend upon the cause of the rash. One of the first steps to treating the rash is to remove the cause if possible. Once the cause is removed, here are other treatment options:25\n\n- **Avoid triggers**: Once the cause of the rash is found, it's important to avoid it. Triggers could be foods, animals, pollen, fragrances, and so much more.\n- **Moisturizers**: Itchy rashes can often benefit from moisture. Fragrance-free lotions and creams can seal in moisture and reduce itching.\n- **Home remedies**: There are several ways you can manage the symptoms of an itchy rash at home. An [oatmeal bath](https:\/\/www.verywellhealth.com\/oatmeal-bath-for-rash-8647090) or cold compress can alleviate the itch.26\n- **Prescription medication**: Certain rashes need prescription medication to clear up. Always follow a healthcare provider's directions on how to use the medication for the best results.\n- **Over-the-counter (OTC) medication**: [OTC medications](https:\/\/www.verywellhealth.com\/over-the-counter-cold-and-flu-medications-770618) can be a good choice for mild rashes. Advil (ibuprofen) can reduce pain and swelling. Hydrocortisone cream and calamine lotion are good for relieving itching, and an antihistamine is helpful for itching, redness, and swelling.\n\nAlways check with a pharmacist or healthcare provider before starting a new medication.","meta_canonical":null,"ml_categories_json":"{\"\/Health\":999,\"\/Health\/Health_Conditions\":987,\"\/Health\/Health_Conditions\/Skin_Conditions\":975}","ml_types_json":"{\"\/Article\":998,\"\/Article\/Tutorial_or_Guide\":390}","ml_intent_types_json":"{\"Informational\":999}","meta_language":"en","attrs_author":null,"attrs_publish_time":0,"attrs_original_publish_time":1663721165,"attrs_is_republished":0,"attrs_nr_words":"2833","attrs_boilerpipe_nr_words":"1961","body_ext_links_number":47,"body_int_links_number":87,"meta_nofollow":0,"meta_noarchive":1,"props_was_rendered":1,"src_redirect":"","download_time_msec":232,"download_ttfb_msec":146,"download_size":57506}

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12 Hidden Causes of Itchy Rashes You Need to Know

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Explore 12 common causes of itchy rashes on arms and legs, including allergies and eczema, and learn when to seek medical advice for persistent symptoms.

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Key Takeaways Contact dermatitis, insect bites, and eczema are some common causes of itchy rashes. Many skin rashes on the arms or legs are mild and will resolve on their own. Contact a healthcare provider if a rash does not improve or gets worse. An itchy rash on your arms or legs can be troubling and disruptive, often caused by potential culprits such as contact dermatitis, eczema, or even insect bites. Fortunately, many rashes are mild, resolving on their own, but knowing when to seek medical guidance can save you from discomfort. HeikeKampe / E+ / Getty Images 1. Contact Dermatitis Contact dermatitis is a skin response that happens after skin has come into contact with an allergen or irritant. Numerous allergens can cause an allergic reaction to the skin. Some of the most common include: 1 Nickel : Found in some jewelry Latex : An ingredient in some rubber products Paraphenylenediamine (PPD) : An ingredient in some permanent hair dye Poison ivy : A low-lying plant found in many areas of the country Fragrances : Perfumes added to cosmetics, shampoos , and lotions A contact dermatitis rash may appear 48 hours or more after exposure, especially if triggered by an allergen. Irritants usually cause rashes within minutes to hours. Symptoms may include: 1 Redness Swelling Itchiness Blisters Flakiness One of the best ways to determine if a rash on the arms or legs is contact dermatitis is to look at the rash pattern. For example, is there a mark from a watch, or does the rash appear on a part of the body where a certain product was used? Contact a healthcare provider if there is no clear cause for the rash. 2. Insect Bites Various insects can cause an itchy rash. You might identify the insect by the rash's appearance. For example, flea bites can lead to: 2 Pain Itchiness Small raised bumps If you're allergic to flea bites, the rash may be more severe, with blistering and swelling. Some fleas carry diseases that can cause serious conditions. Potential conditions that someone can develop after being bitten by a disease-carrying flea include: 3 Flea borne typhus Plague Cat scratch disease (CSD) Other insects that can cause an itchy rash include: Bed bugs: These bites often appear in a line or cluster. 4 Chiggers: Chigger bites are often found in skin folds or parts of the body where clothing fits tightly. They look like bumps, welts, or blisters. 5 Scabies: Scabies can cause rash-like lesions. 6 Browntail moths : The caterpillars of these moths have hairs that can cause a skin rash when touched. In the United States, browntail moths are found primarily in Maine and Cape Cod, Massachusetts. 7 3. Fifth Disease Fifth disease is a viral illness that is also known as parvovirus. It causes a characteristic red rash on the face that appears like a slap. It is most commonly seen in children. There can also be a rash on the arms, legs, chest, and back. However, in healthy people, fifth disease tends to be a mild illness that resolves on its own. It is passed on from person to person through respiratory secretions like saliva from a cough or sneeze. 8 The symptoms of a fifth disease rash include: 8 Rash on the face, arms, or legs Fever Headache Stuffy or runny nose Itching 4. Eczema (Atopic Dermatitis) Eczema is a skin condition that can cause an itchy rash, which may range from mild to severe. Eczema can have genetic factors, but it can also be caused by environmental triggers such as weather conditions, allergens, or irritants. The itchy rash may develop anywhere on the body. In the case of an allergen or irritant, the rash develops where the skin came in contact with the triggering substance. An eczema rash has the following symptoms : 9 Itchiness Swelling Redness Small bumps that can ooze when scratched Scaly skin patches 5. Chickenpox Chickenpox is a very contagious condition that causes an itchy red rash that can cover most of the body, including the arms and legs. Caused by the varicella-zoster virus, chickenpox was a common childhood illness until the vaccine became available in 1995. 10 The classic chickenpox rash is red and itchy. The rash will have blisters filled with fluid that eventually scab over. Other symptoms can include fever, fatigue, headache, and decreased appetite. 10 6. Drug Allergy A drug allergy is an immune response to a certain medication. The immune response can be small, only causing a rash, or the response can be significant, causing anaphylaxis , a life-threatening reaction that causes difficulty breathing and decreased blood pressure. Any drug can cause an allergy, but certain ones are more commonly seen: 11 Penicillin antibiotics Sulfonamide antibiotics Cephalosporins Antiseizure medications Aspirin Nonsteroidal anti-inflammatory drugs (NSAIDs) Symptoms of a drug allergy vary from hives (an itchy rash) and swelling to difficulty breathing. Whenever a drug allergy is suspected, it's important to contact a healthcare provider. 7. Chronic Hives Chronic hives , medically known as chronic spontaneous urticaria, is a red, raised rash that appears at least twice a week and lasts longer than six weeks. 12 Chronic hives often have no known cause, but some cases are associated with an autoimmune disorder, thyroid disease, or hormonal issues. 12 Symptoms of chronic hives include: 13 Raised red welts with pale centers Itchiness Swelling 8. Heat Rash Heat rash is a common skin condition that occurs when sweat blocks the sweat glands. It can occur during hot and humid weather, when you are dressed too warmly for the weather, or when you have a high body temperature. 14 Heat rash can look like a cluster of small blisters. It often appears in skin folds such as under the breasts or in the armpits, but it can also appear on the arms or legs in places where clothing is tight. 14 Heat rash usually goes away on its own. You can get relief faster by getting out of the heat, drying the sweat from your body, and reducing friction from your clothing or in skin folds. 9. Poison Ivy, Oak, or Sumac Poison ivy, poison oak, and poison sumac are plants in the sumac family. The leaves, stems, roots, and fruits of these plants contain urushiol, a skin irritant that can cause an itchy, blistering rash. If you contact one of these plants, you may be able to wash the urushiol off with lukewarm, soapy water. For best results, this needs to be done right away. Some people don't react to urushiol or have only a mild reaction. Other people can develop a more significant reaction that includes large, oozy blisters that crust over. If you have a very severe reaction with difficulty breathing or swallowing, swelling around the face, or a fever, seek emergency medical help right away. 15 Milder cases of poison oak, ivy, or sumac can be treated at home with a cool compress, antihistamine medication, and/or calamine lotion or hydrocortisone cream. 15 10. Fungal Infection Ringworm is a type of fungal infection caused by a group of fungi called dermatophytes. The infection causes an itchy red rash with raised, scaly edges. Ringworm gets its name from the characteristic ring shape of the rash. 16 It can appear on any part of the body, including the arms and legs, though it is more common in skin folds. Ringworm is treated with antifungal medication, which can include topical or oral formulations. The fungi that causes a yeast infection (Candida) can also cause an itchy rash anywhere on the body, though it is more common in skin folds such as the armpits. 11. Molluscum Contagiosum Molluscum contagiosum is a rash caused by a virus. It causes pearl-like bumps to appear on the skin and is more common in children. The bumps often appear in clusters and are about 2 to 5 millimeters (mm). They don't usually look red unless they have been rubbed or scratched. 17 Molluscum contagiosum can itch, and scratching may cause the virus to spread. The itching can be treated with hydrocortisone cream or ointment. 18 Hydrocortisone should not be applied directly to molluscum lesions but rather to the surrounding itchy, red skin. Topical corticosteroids can promote the spread of viral skin reactions like molluscum contagiosum. Molluscum contagiosum doesn't usually require treatment, although it can take nine months or more for the condition to resolve on its own. 19 12. Other Skin Conditions Other common skin conditions can cause an itchy rash. Some are chronic, while others will resolve on their own. Pityriasis rosea : This skin condition often occurs after a viral illness. It causes a red, patchy rash that can be itchy. It usually appears on the torso first, but it can spread to the arms. 20 Psoriasis : This is an autoimmune condition that causes an itchy rash. A psoriasis rash is typically thick and red with silvery scales. 21 If you have a rash that you can't identify that persists for more than a few days or is severe, see a healthcare provider. When Do You Need to See a Healthcare Provider? Rashes can be caused by many different conditions. It's important to know when a rash is serious and needs to be assessed by a healthcare provider. Talk to a healthcare provider if a rash follows any of these patterns: 22 Covers the body Comes on suddenly Spreads quickly Also, it's important to see a healthcare provider if the following symptoms occur with a rash: 22 Fever Difficulty breathing 23 Blisters Signs of an infection Pain How Do Healthcare Providers Diagnose Rashes? Healthcare providers can usually diagnose a rash largely based on its appearance and health history. If a healthcare provider cannot determine the cause based on their evaluation, they may order additional testing. Patch testing is one diagnostic tool used to diagnose some allergies. It is a helpful test when a rash is likely caused by an unknown allergen. Blood testing is also another tool used to diagnose rashes that may have caused a blood infection, changes in antibodies, or have been caused by an allergy. KOH testing is done by scraping a small amount of skin and placing it under a microscope to look for an infection. It is a painless procedure. 24 Skin biopsy is a procedure in which a doctor cuts a piece of skin out for examination under a microscope. In some cases, an itchy rash may be biopsied to rule out a type of skin cancer. What to Do About Your Itchy Rash Treatment for an itchy rash on the arms and legs will depend upon the cause of the rash. One of the first steps to treating the rash is to remove the cause if possible. Once the cause is removed, here are other treatment options: 25 Avoid triggers : Once the cause of the rash is found, it's important to avoid it. Triggers could be foods, animals, pollen, fragrances, and so much more. Moisturizers : Itchy rashes can often benefit from moisture. Fragrance-free lotions and creams can seal in moisture and reduce itching. Home remedies : There are several ways you can manage the symptoms of an itchy rash at home. An oatmeal bath or cold compress can alleviate the itch. 26 Prescription medication : Certain rashes need prescription medication to clear up. Always follow a healthcare provider's directions on how to use the medication for the best results. Over-the-counter (OTC) medication : OTC medications can be a good choice for mild rashes. Advil (ibuprofen) can reduce pain and swelling. Hydrocortisone cream and calamine lotion are good for relieving itching, and an antihistamine is helpful for itching, redness, and swelling. Always check with a pharmacist or healthcare provider before starting a new medication.

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Our website is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Ⓒ 2026 People Inc. — All rights reserved # 12 Hidden Causes of Itchy Rashes You Need to Know By [Patty Weasler, RN, BSN](https://www.verywellhealth.com/patty-weasler-5219663) Updated on January 28, 2026 Medically reviewed by [Corinne Savides Happel, MD](https://www.verywellhealth.com/corinne-savides-happel-md-4781313) Table of Contents View All Table of Contents - [Causes](https://www.verywellhealth.com/itchy-rash-on-arms-and-legs-5272152#toc-1-contact-dermatitis) - [When to Get Help](https://www.verywellhealth.com/itchy-rash-on-arms-and-legs-5272152#toc-when-do-you-need-to-see-a-healthcare-provider) - [Diagnosis](https://www.verywellhealth.com/itchy-rash-on-arms-and-legs-5272152#toc-how-do-healthcare-providers-diagnose-rashes) - [Treatment](https://www.verywellhealth.com/itchy-rash-on-arms-and-legs-5272152#toc-what-to-do-about-your-itchy-rash) ### Key Takeaways - Contact dermatitis, insect bites, and eczema are some common causes of itchy rashes. - Many skin rashes on the arms or legs are mild and will resolve on their own. - Contact a healthcare provider if a rash does not improve or gets worse. An itchy rash on your arms or legs can be troubling and disruptive, often caused by potential culprits such as contact dermatitis, eczema, or even insect bites. Fortunately, many rashes are mild, resolving on their own, but knowing when to seek medical guidance can save you from discomfort. ![itchy woman scratching her arm](https://www.verywellhealth.com/thmb/Kah-tfeoq3WEnFzu4iVJVmmFw6E=/1500x0/filters:no_upscale\(\):max_bytes\(150000\):strip_icc\(\)/GettyImages-136359824-57155a8f3df78c3fa225efc9.jpg) ![itchy woman scratching her arm](https://www.verywellhealth.com/thmb/Kah-tfeoq3WEnFzu4iVJVmmFw6E=/1500x0/filters:no_upscale\(\):max_bytes\(150000\):strip_icc\(\)/GettyImages-136359824-57155a8f3df78c3fa225efc9.jpg) HeikeKampe / E+ / Getty Images ## 1\. Contact Dermatitis Contact dermatitis is a skin response that happens after skin has come into contact with an allergen or irritant. Numerous allergens can cause an allergic reaction to the skin. Some of the most common include:1 - **Nickel**: Found in some jewelry - **Latex**: An ingredient in some rubber products - **Paraphenylenediamine (PPD)**:An ingredient in some permanent hair dye - **Poison ivy**: A low-lying plant found in many areas of the country - **Fragrances**: Perfumes added to cosmetics, [shampoos](https://www.verywellhealth.com/allergic-reaction-shampoo-5216076), and lotions A contact dermatitis [rash](https://www.verywellhealth.com/skin-rash-causes-4020286) may appear 48 hours or more after exposure, especially if triggered by an allergen. Irritants usually cause rashes within minutes to hours. Symptoms may include:1 - Redness - Swelling - Itchiness - Blisters - Flakiness One of the best ways to determine if a rash on the arms or legs is contact dermatitis is to look at the rash pattern. For example, is there a mark from a watch, or does the rash appear on a part of the body where a certain product was used? Contact a healthcare provider if there is no clear cause for the rash. ## 2\. Insect Bites Various insects can cause an itchy rash. You might identify the insect by the rash's appearance. For example, [flea bites](https://www.verywellhealth.com/bed-bug-bites-vs-flea-bites-7566912) can lead to:2 - Pain - Itchiness - Small raised bumps If you're allergic to flea bites, the rash may be more severe, with blistering and swelling. Some fleas carry diseases that can cause serious conditions. Potential conditions that someone can develop after being bitten by a disease-carrying flea include:3 - Flea borne [typhus](https://www.verywellhealth.com/typhus-5080159) - [Plague](https://www.verywellhealth.com/seven-things-you-dont-know-about-motion-sickness-1192151) - [Cat scratch disease](https://www.verywellhealth.com/cat-scratch-fever-overview-and-more-5211722) (CSD) Other insects that can cause an itchy rash include: - **Bed bugs:** These bites often appear in a line or cluster.4 - **Chiggers:** Chigger bites are often found in skin folds or parts of the body where clothing fits tightly. They look like bumps, welts, or blisters.5 - **Scabies:** Scabies can cause rash-like lesions.6 - [**Browntail moths**](https://www.verywellhealth.com/browntail-moth-rash-8607998)**:** The caterpillars of these moths have hairs that can cause a skin rash when touched. In the United States, browntail moths are found primarily in Maine and Cape Cod, Massachusetts.7 ## 3\. Fifth Disease [Fifth disease](https://www.verywellhealth.com/fifth-disease-7553036) is a viral illness that is also known as parvovirus. It causes a characteristic red rash on the face that appears like a slap. It is most commonly seen in children. There can also be a rash on the arms, legs, chest, and back. However,in healthy people, fifth disease tends to be a mild illness that resolves on its own. It is passed on from person to person through respiratory secretions like saliva from a cough or sneeze.8 The symptoms of a fifth disease rash include:8 - Rash on the face, arms, or legs - [Fever](https://www.verywellhealth.com/fever-8685009) - [Headache](https://www.verywellhealth.com/vision-and-headache-3422017) - Stuffy or runny nose - Itching ## 4\. Eczema (Atopic Dermatitis) Eczema is a skin condition that can cause an itchy rash, which may range from mild to severe. Eczema can have genetic factors, but it can also be caused by environmental triggers such as weather conditions, allergens, or irritants. The itchy rash may develop anywhere on the body. In the case of an allergen or irritant, the rash develops where the skin came in contact with the triggering substance. An eczema rash has the following [symptoms](https://www.verywellhealth.com/eczema-symptoms-82717):9 - Itchiness - Swelling - Redness - Small bumps that can ooze when scratched - Scaly skin patches ## 5\. Chickenpox [Chickenpox](https://www.verywellhealth.com/chicken-pox-4012865) is a very contagious condition that causes an itchy red rash that can cover most of the body, including the arms and legs. Caused by the varicella-zoster virus, chickenpox was a common childhood illness until the [vaccine](https://www.verywellhealth.com/chicken-pox-prevention-vaccine-1068748) became available in 1995.10 The classic chickenpox rash is red and itchy. The rash will have blisters filled with fluid that eventually scab over. Other [symptoms](https://www.verywellhealth.com/symptoms-of-chicken-pox-2634340) can include fever, fatigue, headache, and decreased appetite.10 ## 6\. Drug Allergy A [drug allergy](https://www.verywellhealth.com/types-of-allergies-5205627) is an immune response to a certain medication. The immune response can be small, only causing a rash, or the response can be significant, causing [anaphylaxis](https://www.verywellhealth.com/symptoms-of-anaphylactic-shock-1298253), a life-threatening reaction that causes difficulty breathing and decreased blood pressure. Any drug can cause an allergy, but certain ones are more commonly seen:11 - Penicillin antibiotics - Sulfonamide antibiotics - Cephalosporins - [Antiseizure medications](https://www.verywellhealth.com/anti-epileptic-drugs-4686301) - Aspirin - [Nonsteroidal anti-inflammatory drugs (NSAIDs)](https://www.verywellhealth.com/best-anti-inflammatory-medication-2548734) Symptoms of a drug allergy vary from [hives](https://www.verywellhealth.com/urticaria-signs-symptoms-1069422) (an itchy rash) and swelling to difficulty breathing. Whenever a drug allergy is suspected, it's important to contact a healthcare provider. ## 7\. Chronic Hives Chronic [hives](https://www.verywellhealth.com/urticaria-signs-symptoms-1069422), medically known as chronic spontaneous urticaria, is a red, raised rash that appears at least twice a week and lasts longer than six weeks.12 Chronic hives often have no known cause, but some cases are associated with an autoimmune disorder, thyroid disease, or hormonal issues.12 Symptoms of chronic hives include:13 - Raised red welts with pale centers - Itchiness - Swelling ## 8\. Heat Rash Heat rash is a common skin condition that occurs when sweat blocks the sweat glands. It can occur during hot and humid weather, when you are dressed too warmly for the weather, or when you have a high body temperature.14 Heat rash can look like a cluster of small blisters. It often appears in skin folds such as under the breasts or in the armpits, but it can also appear on the arms or legs in places where clothing is tight.14 Heat rash usually goes away on its own. You can get relief faster by getting out of the heat, drying the sweat from your body, and reducing friction from your clothing or in skin folds. ## 9\. Poison Ivy, Oak, or Sumac Poison ivy, poison oak, and poison sumac are plants in the sumac family. The leaves, stems, roots, and fruits of these plants contain urushiol, a skin irritant that can cause an itchy, blistering rash. If you contact one of these plants, you may be able to wash the urushiol off with lukewarm, soapy water. For best results, this needs to be done right away. Some people don't react to urushiol or have only a mild reaction. Other people can develop a more significant reaction that includes large, oozy blisters that crust over. If you have a very severe reaction with difficulty breathing or swallowing, swelling around the face, or a fever, seek emergency medical help right away.15 Milder cases of poison oak, ivy, or sumac can be treated at home with a cool compress, antihistamine medication, and/or calamine lotion or hydrocortisone cream.15 ## 10\. Fungal Infection Ringworm is a type of fungal infection caused by a group of fungi called dermatophytes. The infection causes an itchy red rash with raised, scaly edges. Ringworm gets its name from the characteristic ring shape of the rash.16 It can appear on any part of the body, including the arms and legs, though it is more common in skin folds. Ringworm is treated with antifungal medication, which can include topical or oral formulations. The fungi that causes a yeast infection (Candida) can also cause an itchy rash anywhere on the body, though it is more common in skin folds such as the armpits. ## 11\. Molluscum Contagiosum Molluscum contagiosum is a rash caused by a virus. It causes pearl-like bumps to appear on the skin and is more common in children. The bumps often appear in clusters and are about 2 to 5 millimeters (mm). They don't usually look red unless they have been rubbed or scratched.17 Molluscum contagiosum can itch, and scratching may cause the virus to spread. The itching can be treated with hydrocortisone cream or ointment.18 Hydrocortisone should not be applied directly to molluscum lesions but rather to the surrounding itchy, red skin. Topical corticosteroids can promote the spread of viral skin reactions like molluscum contagiosum. Molluscum contagiosum doesn't usually require treatment, although it can take nine months or more for the condition to resolve on its own.19 ## 12\. Other Skin Conditions Other common skin conditions can cause an itchy rash. Some are chronic, while others will resolve on their own. - [**Pityriasis rosea**](https://www.verywellhealth.com/pityriasis-rosea-pictures-4020316): This skin condition often occurs after a viral illness. It causes a red, patchy rash that can be itchy. It usually appears on the torso first, but it can spread to the arms.20 - [Psoriasis](https://www.verywellhealth.com/psoriasis-7099867): This is an autoimmune condition that causes an itchy rash. A psoriasis rash is typically thick and red with silvery scales.21 If you have a rash that you can't identify that persists for more than a few days or is severe, see a healthcare provider. ## When Do You Need to See a Healthcare Provider? Rashes can be caused by many different conditions. It's important to know when a rash is serious and needs to be assessed by a healthcare provider. Talk to a healthcare provider if a rash follows any of these patterns:22 - Covers the body - Comes on suddenly - Spreads quickly Also, it's important to see a healthcare provider if the following symptoms occur with a rash:22 - [Fever](https://www.verywellhealth.com/fever-8685009) - [Difficulty breathing](https://www.verywellhealth.com/symptoms-of-anaphylactic-shock-1298253)23 - [Blisters](https://www.verywellhealth.com/rashes-with-blisters-1069592) - [Signs of an infection](https://www.verywellhealth.com/infection-symptoms-5185799) - Pain ## How Do Healthcare Providers Diagnose Rashes? Healthcare providers can usually diagnose a rash largely based on its appearance and health history. If a healthcare provider cannot determine the cause based on their evaluation, they may order additional testing. - [**Patch testing**](https://www.verywellhealth.com/patch-testing-for-contact-dermatitis-82758) is one diagnostic tool used to diagnose some allergies. It is a helpful test when a rash is likely caused by an unknown allergen. - **Blood testing** is also another tool used to diagnose rashes that may have caused a blood infection, changes in antibodies, or have been caused by an allergy. - [**KOH testing**](https://www.verywellhealth.com/tinea-versicolor-8576648) is done by scraping a small amount of skin and placing it under a microscope to look for an infection. It is a painless procedure.24 - **Skin biopsy** is a procedure in which a doctor cuts a piece of skin out for examination under a microscope. In some cases, an itchy rash may be biopsied to rule out a type of skin cancer. ## What to Do About Your Itchy Rash Treatment for an itchy rash on the arms and legs will depend upon the cause of the rash. One of the first steps to treating the rash is to remove the cause if possible. Once the cause is removed, here are other treatment options:25 - **Avoid triggers**: Once the cause of the rash is found, it's important to avoid it. Triggers could be foods, animals, pollen, fragrances, and so much more. - **Moisturizers**: Itchy rashes can often benefit from moisture. Fragrance-free lotions and creams can seal in moisture and reduce itching. - **Home remedies**: There are several ways you can manage the symptoms of an itchy rash at home. An [oatmeal bath](https://www.verywellhealth.com/oatmeal-bath-for-rash-8647090) or cold compress can alleviate the itch.26 - **Prescription medication**: Certain rashes need prescription medication to clear up. Always follow a healthcare provider's directions on how to use the medication for the best results. - **Over-the-counter (OTC) medication**: [OTC medications](https://www.verywellhealth.com/over-the-counter-cold-and-flu-medications-770618) can be a good choice for mild rashes. Advil (ibuprofen) can reduce pain and swelling. Hydrocortisone cream and calamine lotion are good for relieving itching, and an antihistamine is helpful for itching, redness, and swelling. Always check with a pharmacist or healthcare provider before starting a new medication. Read more: - [Health A-Z](https://www.verywellhealth.com/health-a-z-4014770) - [Skin Health](https://www.verywellhealth.com/skin-health-4014649) 26 Sources Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our [editorial process](https://www.verywellhealth.com/verywell-editorial-process-4777042) to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy. 1. Johns Hopkins Medicine. [Contact dermatitis](https://www.hopkinsmedicine.org/health/conditions-and-diseases/contact-dermatitis). 2. Johns Hopkins Medicine. [Fleas, mites, and chiggers](https://www.hopkinsmedicine.org/health/conditions-and-diseases/fleas-mites-and-chiggers). 3. Centers for Disease Control and Prevention. [About fleas](https://www.cdc.gov/fleas/about/). 4. National Library of Medicine. [Bed bugs](https://medlineplus.gov/bedbugs.html). 5. National Library of Medicine. [Chiggers](https://medlineplus.gov/ency/article/001333.htm). 6. National Library of Medicine. [Insect bites and stings](https://medlineplus.gov/ency/article/000033.htm). 7. Maine.gov Division of Disease Surveillance. [Browntail moths](https://www.maine.gov/dhhs/mecdc/infectious-disease/epi/vector-borne/browntail-moth/index.shtml). 8. Centers for Disease Control and Prevention. [About parvovirus B19](https://www.cdc.gov/parvovirus-b19/about/index.html). 9. Johns Hopkins Medicine. [Eczema](https://www.hopkinsmedicine.org/health/conditions-and-diseases/eczema). 10. Centers for Disease Control and Prevention. [Chickenpox (varicella)](https://www.cdc.gov/chickenpox/). 11. American College of Allergy, Asthma, & Immunology. [Drug allergies](https://acaai.org/allergies/allergic-conditions/drug-allergies/). 12. American College of Allergy, Asthma & Immunology. [Chronic spontaneous/idiopathic urticaria (chronic hives)](https://acaai.org/allergies/allergic-conditions/skin-allergy/chronic-hives/). 13. Kanani A, Betschel SD, Warrington R. [Urticaria and angioedema](https://doi.org/10.1186/s13223-018-0288-z). *Allergy Asthma Clin Immunol*. 2018;14(2):59. doi:10.1186/s13223-018-0288-z 14. American Academy of Family Physicians. [Heat rash](https://familydoctor.org/condition/heat-rash/?adfree=true). 15. American Academy of Dermatology Association. [Poison ivy, oak, and sumac: How to treat the rash](https://www.aad.org/public/everyday-care/itchy-skin/poison-ivy/treat-rash). 16. Johns Hopkins Medicine. [Tinea infections (ringworm)](https://www.hopkinsmedicine.org/health/conditions-and-diseases/tinea-infections-ringworm). 17. National Library of Medicine. [Molluscum contagiosum](https://medlineplus.gov/ency/article/000826.htm). 18. American Academy of Dermatology Association. [Molluscum contagiosum: Tips for managing](https://www.aad.org/public/diseases/a-z/molluscum-contagiosum-tips). 19. American Academy of Dermatology Association. [Molluscum contagiosum: Diagnosis and treatment](https://www.aad.org/public/diseases/a-z/molluscum-contagiosum-treatment). 20. American Academy of Dermatology Association. [Pityriasis rosea: FAQs](https://www.aad.org/public/diseases/a-z/pityriasis-rosea-overview). 21. National Library of Medicine. [Psoriasis](https://medlineplus.gov/psoriasis.html). 22. American Academy of Dermatology Association. [Rash 101 in adults](https://www.aad.org/public/everyday-care/itchy-skin/rash/rash-101). 23. Fischer D, Vander Leek TK, Ellis AK, Kim H. [Anaphylaxis](https://doi.org/10.1186/s13223-018-0283-4). *Allergy Asthma Clin Immunol*. 2018;14(2):54. doi:10.1186/s13223-018-0283-4 24. Mohanty A, Gupta P, Arathi K, et al. [Evaluation of direct examination, culture, and histopathology in the diagnosis of mucormycosis: Reiterating the role of KOH mount for early diagnosis](https://doi.org/10.7759/cureus.19455). *Cureus*. 2021 Nov;13(11):e19455. doi:10.7759/cureus.19455 25. Nowak D, Yeung J. [Diagnosis and treatment of pruritus](https://pubmed.ncbi.nlm.nih.gov/29237630/). *Can Fam Physician*. 2017;63(12):918-924. 26. Johns Hopkins Medicine. [Poison ivy](https://www.hopkinsmedicine.org/health/conditions-and-diseases/poison-ivy--poison-oak). ![Patty Weasler](https://www.verywellhealth.com/thmb/hUYj-cI8BMz9t3kSJscXQPrfl80=/144x144/filters:no_upscale\(\):max_bytes\(150000\):strip_icc\(\)/PattyWeaslerbiopicverywell-8c11095ed0114702838c9bbd00aa1485.jpg) ![Patty Weasler](https://www.verywellhealth.com/thmb/hUYj-cI8BMz9t3kSJscXQPrfl80=/144x144/filters:no_upscale\(\):max_bytes\(150000\):strip_icc\(\)/PattyWeaslerbiopicverywell-8c11095ed0114702838c9bbd00aa1485.jpg) By [Patty Weasler, RN, BSN](https://www.verywellhealth.com/patty-weasler-5219663) Weasler is a Wisconsin-based registered nurse with over a decade of experience in pediatric critical care. [See Our Editorial Process](https://www.verywellhealth.com/verywell-editorial-process-4777042) [Meet Our Medical Expert Board](https://www.verywellhealth.com/meet-our-medical-expert-board-11762003) Share Feedback Was this page helpful? Thanks for your feedback\! What is your feedback? 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### Key Takeaways - Contact dermatitis, insect bites, and eczema are some common causes of itchy rashes. - Many skin rashes on the arms or legs are mild and will resolve on their own. - Contact a healthcare provider if a rash does not improve or gets worse. An itchy rash on your arms or legs can be troubling and disruptive, often caused by potential culprits such as contact dermatitis, eczema, or even insect bites. Fortunately, many rashes are mild, resolving on their own, but knowing when to seek medical guidance can save you from discomfort. HeikeKampe / E+ / Getty Images ## 1\. Contact Dermatitis Contact dermatitis is a skin response that happens after skin has come into contact with an allergen or irritant. Numerous allergens can cause an allergic reaction to the skin. Some of the most common include:1 - **Nickel**: Found in some jewelry - **Latex**: An ingredient in some rubber products - **Paraphenylenediamine (PPD)**:An ingredient in some permanent hair dye - **Poison ivy**: A low-lying plant found in many areas of the country - **Fragrances**: Perfumes added to cosmetics, [shampoos](https://www.verywellhealth.com/allergic-reaction-shampoo-5216076), and lotions A contact dermatitis [rash](https://www.verywellhealth.com/skin-rash-causes-4020286) may appear 48 hours or more after exposure, especially if triggered by an allergen. Irritants usually cause rashes within minutes to hours. Symptoms may include:1 - Redness - Swelling - Itchiness - Blisters - Flakiness One of the best ways to determine if a rash on the arms or legs is contact dermatitis is to look at the rash pattern. For example, is there a mark from a watch, or does the rash appear on a part of the body where a certain product was used? Contact a healthcare provider if there is no clear cause for the rash. ## 2\. Insect Bites Various insects can cause an itchy rash. You might identify the insect by the rash's appearance. For example, [flea bites](https://www.verywellhealth.com/bed-bug-bites-vs-flea-bites-7566912) can lead to:2 - Pain - Itchiness - Small raised bumps If you're allergic to flea bites, the rash may be more severe, with blistering and swelling. Some fleas carry diseases that can cause serious conditions. Potential conditions that someone can develop after being bitten by a disease-carrying flea include:3 - Flea borne [typhus](https://www.verywellhealth.com/typhus-5080159) - [Plague](https://www.verywellhealth.com/seven-things-you-dont-know-about-motion-sickness-1192151) - [Cat scratch disease](https://www.verywellhealth.com/cat-scratch-fever-overview-and-more-5211722) (CSD) Other insects that can cause an itchy rash include: - **Bed bugs:** These bites often appear in a line or cluster.4 - **Chiggers:** Chigger bites are often found in skin folds or parts of the body where clothing fits tightly. They look like bumps, welts, or blisters.5 - **Scabies:** Scabies can cause rash-like lesions.6 - [**Browntail moths**](https://www.verywellhealth.com/browntail-moth-rash-8607998)**:** The caterpillars of these moths have hairs that can cause a skin rash when touched. In the United States, browntail moths are found primarily in Maine and Cape Cod, Massachusetts.7 ## 3\. Fifth Disease [Fifth disease](https://www.verywellhealth.com/fifth-disease-7553036) is a viral illness that is also known as parvovirus. It causes a characteristic red rash on the face that appears like a slap. It is most commonly seen in children. There can also be a rash on the arms, legs, chest, and back. However,in healthy people, fifth disease tends to be a mild illness that resolves on its own. It is passed on from person to person through respiratory secretions like saliva from a cough or sneeze.8 The symptoms of a fifth disease rash include:8 - Rash on the face, arms, or legs - [Fever](https://www.verywellhealth.com/fever-8685009) - [Headache](https://www.verywellhealth.com/vision-and-headache-3422017) - Stuffy or runny nose - Itching ## 4\. Eczema (Atopic Dermatitis) Eczema is a skin condition that can cause an itchy rash, which may range from mild to severe. Eczema can have genetic factors, but it can also be caused by environmental triggers such as weather conditions, allergens, or irritants. The itchy rash may develop anywhere on the body. In the case of an allergen or irritant, the rash develops where the skin came in contact with the triggering substance. An eczema rash has the following [symptoms](https://www.verywellhealth.com/eczema-symptoms-82717):9 - Itchiness - Swelling - Redness - Small bumps that can ooze when scratched - Scaly skin patches ## 5\. Chickenpox [Chickenpox](https://www.verywellhealth.com/chicken-pox-4012865) is a very contagious condition that causes an itchy red rash that can cover most of the body, including the arms and legs. Caused by the varicella-zoster virus, chickenpox was a common childhood illness until the [vaccine](https://www.verywellhealth.com/chicken-pox-prevention-vaccine-1068748) became available in 1995.10 The classic chickenpox rash is red and itchy. The rash will have blisters filled with fluid that eventually scab over. Other [symptoms](https://www.verywellhealth.com/symptoms-of-chicken-pox-2634340) can include fever, fatigue, headache, and decreased appetite.10 ## 6\. Drug Allergy A [drug allergy](https://www.verywellhealth.com/types-of-allergies-5205627) is an immune response to a certain medication. The immune response can be small, only causing a rash, or the response can be significant, causing [anaphylaxis](https://www.verywellhealth.com/symptoms-of-anaphylactic-shock-1298253), a life-threatening reaction that causes difficulty breathing and decreased blood pressure. Any drug can cause an allergy, but certain ones are more commonly seen:11 - Penicillin antibiotics - Sulfonamide antibiotics - Cephalosporins - [Antiseizure medications](https://www.verywellhealth.com/anti-epileptic-drugs-4686301) - Aspirin - [Nonsteroidal anti-inflammatory drugs (NSAIDs)](https://www.verywellhealth.com/best-anti-inflammatory-medication-2548734) Symptoms of a drug allergy vary from [hives](https://www.verywellhealth.com/urticaria-signs-symptoms-1069422) (an itchy rash) and swelling to difficulty breathing. Whenever a drug allergy is suspected, it's important to contact a healthcare provider. ## 7\. Chronic Hives Chronic [hives](https://www.verywellhealth.com/urticaria-signs-symptoms-1069422), medically known as chronic spontaneous urticaria, is a red, raised rash that appears at least twice a week and lasts longer than six weeks.12 Chronic hives often have no known cause, but some cases are associated with an autoimmune disorder, thyroid disease, or hormonal issues.12 Symptoms of chronic hives include:13 - Raised red welts with pale centers - Itchiness - Swelling ## 8\. Heat Rash Heat rash is a common skin condition that occurs when sweat blocks the sweat glands. It can occur during hot and humid weather, when you are dressed too warmly for the weather, or when you have a high body temperature.14 Heat rash can look like a cluster of small blisters. It often appears in skin folds such as under the breasts or in the armpits, but it can also appear on the arms or legs in places where clothing is tight.14 Heat rash usually goes away on its own. You can get relief faster by getting out of the heat, drying the sweat from your body, and reducing friction from your clothing or in skin folds. ## 9\. Poison Ivy, Oak, or Sumac Poison ivy, poison oak, and poison sumac are plants in the sumac family. The leaves, stems, roots, and fruits of these plants contain urushiol, a skin irritant that can cause an itchy, blistering rash. If you contact one of these plants, you may be able to wash the urushiol off with lukewarm, soapy water. For best results, this needs to be done right away. Some people don't react to urushiol or have only a mild reaction. Other people can develop a more significant reaction that includes large, oozy blisters that crust over. If you have a very severe reaction with difficulty breathing or swallowing, swelling around the face, or a fever, seek emergency medical help right away.15 Milder cases of poison oak, ivy, or sumac can be treated at home with a cool compress, antihistamine medication, and/or calamine lotion or hydrocortisone cream.15 ## 10\. Fungal Infection Ringworm is a type of fungal infection caused by a group of fungi called dermatophytes. The infection causes an itchy red rash with raised, scaly edges. Ringworm gets its name from the characteristic ring shape of the rash.16 It can appear on any part of the body, including the arms and legs, though it is more common in skin folds. Ringworm is treated with antifungal medication, which can include topical or oral formulations. The fungi that causes a yeast infection (Candida) can also cause an itchy rash anywhere on the body, though it is more common in skin folds such as the armpits. ## 11\. Molluscum Contagiosum Molluscum contagiosum is a rash caused by a virus. It causes pearl-like bumps to appear on the skin and is more common in children. The bumps often appear in clusters and are about 2 to 5 millimeters (mm). They don't usually look red unless they have been rubbed or scratched.17 Molluscum contagiosum can itch, and scratching may cause the virus to spread. The itching can be treated with hydrocortisone cream or ointment.18 Hydrocortisone should not be applied directly to molluscum lesions but rather to the surrounding itchy, red skin. Topical corticosteroids can promote the spread of viral skin reactions like molluscum contagiosum. Molluscum contagiosum doesn't usually require treatment, although it can take nine months or more for the condition to resolve on its own.19 ## 12\. Other Skin Conditions Other common skin conditions can cause an itchy rash. Some are chronic, while others will resolve on their own. - [**Pityriasis rosea**](https://www.verywellhealth.com/pityriasis-rosea-pictures-4020316): This skin condition often occurs after a viral illness. It causes a red, patchy rash that can be itchy. It usually appears on the torso first, but it can spread to the arms.20 - [Psoriasis](https://www.verywellhealth.com/psoriasis-7099867): This is an autoimmune condition that causes an itchy rash. A psoriasis rash is typically thick and red with silvery scales.21 If you have a rash that you can't identify that persists for more than a few days or is severe, see a healthcare provider. ## When Do You Need to See a Healthcare Provider? Rashes can be caused by many different conditions. It's important to know when a rash is serious and needs to be assessed by a healthcare provider. Talk to a healthcare provider if a rash follows any of these patterns:22 - Covers the body - Comes on suddenly - Spreads quickly Also, it's important to see a healthcare provider if the following symptoms occur with a rash:22 - [Fever](https://www.verywellhealth.com/fever-8685009) - [Difficulty breathing](https://www.verywellhealth.com/symptoms-of-anaphylactic-shock-1298253)23 - [Blisters](https://www.verywellhealth.com/rashes-with-blisters-1069592) - [Signs of an infection](https://www.verywellhealth.com/infection-symptoms-5185799) - Pain ## How Do Healthcare Providers Diagnose Rashes? Healthcare providers can usually diagnose a rash largely based on its appearance and health history. If a healthcare provider cannot determine the cause based on their evaluation, they may order additional testing. - [**Patch testing**](https://www.verywellhealth.com/patch-testing-for-contact-dermatitis-82758) is one diagnostic tool used to diagnose some allergies. It is a helpful test when a rash is likely caused by an unknown allergen. - **Blood testing** is also another tool used to diagnose rashes that may have caused a blood infection, changes in antibodies, or have been caused by an allergy. - [**KOH testing**](https://www.verywellhealth.com/tinea-versicolor-8576648) is done by scraping a small amount of skin and placing it under a microscope to look for an infection. It is a painless procedure.24 - **Skin biopsy** is a procedure in which a doctor cuts a piece of skin out for examination under a microscope. In some cases, an itchy rash may be biopsied to rule out a type of skin cancer. ## What to Do About Your Itchy Rash Treatment for an itchy rash on the arms and legs will depend upon the cause of the rash. One of the first steps to treating the rash is to remove the cause if possible. Once the cause is removed, here are other treatment options:25 - **Avoid triggers**: Once the cause of the rash is found, it's important to avoid it. Triggers could be foods, animals, pollen, fragrances, and so much more. - **Moisturizers**: Itchy rashes can often benefit from moisture. Fragrance-free lotions and creams can seal in moisture and reduce itching. - **Home remedies**: There are several ways you can manage the symptoms of an itchy rash at home. An [oatmeal bath](https://www.verywellhealth.com/oatmeal-bath-for-rash-8647090) or cold compress can alleviate the itch.26 - **Prescription medication**: Certain rashes need prescription medication to clear up. Always follow a healthcare provider's directions on how to use the medication for the best results. - **Over-the-counter (OTC) medication**: [OTC medications](https://www.verywellhealth.com/over-the-counter-cold-and-flu-medications-770618) can be a good choice for mild rashes. Advil (ibuprofen) can reduce pain and swelling. Hydrocortisone cream and calamine lotion are good for relieving itching, and an antihistamine is helpful for itching, redness, and swelling. Always check with a pharmacist or healthcare provider before starting a new medication.

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