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A rash is a noticeable change in the texture or color of the skin. The skin may become itchy, bumpy, chapped, scaly, or otherwise irritated. Rashes are caused by a wide range of conditions, including allergies, medication, cosmetics, and various diseases. The rash is often reddish and itchy, with a scaly texture. 2  bug bites: tick bites are of particular concern, as they can transmit disease. 3  psoriasis: a scaly, itchy, red rash that forms along the scalp and joints. 4  dandruff: an itchy, flaky rash on the scalp.
Rashes Caused By Allergies. Hives. The most common allergic rash is hives, an extremely itchy rash that consists of raised large welts on the surface of the body, often circular with a pale center. Hives can result from an allergic reaction to medicines, foods, viral infections, or insect stings and bites. For localized itchy rashes, apply 1% hydrocortisone cream if the rash is not a result of fungus, chicken pox, or bacterial infection. 2  If your child has just started taking a new medicine, and develops a rash, consult your physician immediately.