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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.
Infection related rashes are easy to spot because they normally come with other symptoms. They also usually appear after contact with an infected person. There are dozens of different types of infections that can cause itchy red bumps to appear on the skin, including chickenpox and impetigo. Skin diseases caused by parasites, such as scabies, also fall into this category. Before talking to a doctor, take a few minutes to list out your other symptoms (if you have any).