DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Dermatographic urticaria. Close-up of a dermatographic (skin writing) rash on the chest and shoulders of a 25-year-old male patient with urticaria (hives). Urticaria is a skin condition in which a rash of itchy wheals or lumps develops on the skin. It most often occurs as an acute allergic response but can also result from heat, cold, sunlight or, less frequently, other medical conditions like cancer.
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