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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.
Poison ivy, poison oak, and poison sumac are three of the most common causes of allergic contact dermatitis in the U.S. They all contain an oil called urushiol, which triggers an allergic reaction, typically an itchy rash. A mild reaction might last 5 to 12 days, while a more severe reaction can last 30 days or longer.