50.5 MB (2.3 MB compressed)
5157 x 3425 pixels
43.7 x 29.0 cm ⏐ 17.2 x 11.4 in (300dpi)
DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
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Urticaria rash (red patches) on a 23-year-old woman's skin. 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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