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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.
Infectious causes of itching include sexually transmitted diseases (STDs), parasites (such as scabies, fleas, bedbugs, pinworms, and lice), and viral rashes. Perhaps the best definition of itching is by the response it evokes -- it is a feeling that makes you want to scratch.