DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Urticaria rash (red patches) on a 58-year-old woman's abdomen. Urticaria (also called hives) is a response of the body's immune system, usually to an allergen, stress or a drug. The rash is itchy and painful. Treatment is to avoid the underlying cause. This is an idiopathic rash, which means that its cause is unknown.
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