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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.
Contact with insects or parasites is another common cause of itching. Mosquito bites, flea bites, and lice infestations can often result in itchy skin. While annoying, these conditions are easily treated with over-the-counter remedies. Various kinds of infection can also cause itching without rash. Vaginal itching in women is often caused by a fungal or yeast infection. Athleteâs foot is another example of an itchy fungal infection that doesn't usually cause a rash.