DAVID R. FRAZIER / SCIENCE PHOTO LIBRARY DAVID R. FRAZIER / SCIENCE PHOTO LIBRARY
A woman with severe sunburn. Sunburn is the skin's response to excessive ultraviolet radiation. The character and amount of UV radiation vary with the seasonal and atmospheric conditions. Symptoms of sunburn range from mild erythema (redness) with subsequent scaling to pain, swelling, skin tenderness, and blisters.
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