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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.
Poor blood circulation, especially on the legs, can cause the skin to itch without rash. Poor blood circulation can cause dry skin which can result to itchy skin. Iron deficiency. Iron is needed in the production of red blood cells, and when there is low red blood cell count, and then blood circulation is not as efficient as it should be.