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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.
Itchiness is usually associated with skin disorders, but it can sometimes be caused by an underlying medical condition. Infections, kidney disease, hormonal conditions and certain cancers can cause itchy skin.nfection. Many infections common during childhood, including measles, rubella and chickenpox, can cause itchy skin. All of these conditions are caused by viral illnesses and typically begin with flu-like symptoms accompanied by an itchy rash.