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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.
Dry skin. Dry skin is one of the most common causes of itchy skin. If people do not see any bright red bumps or notice a sudden change to their skin, dry skin is a likely cause. Environmental factors that can lead to dry skin include excessively hot or cold weather with low humidity, as well as washing too much.