Psoriasis vulgaris, Koebner phenomenon occurs when psoriasis spreads into an area of trauma, seen here with well-delineated erythematous plaque with a silvery-white scale characteristic of psoriasis.
Color Atlas & Synopsis of Pediatric Dermatology Kay Shou-Mei Kane, Jen Bissonette Ryder, Richard Allen Johnson, Howard P. Baden, Alexander Stratigos Copyright 2002 by The McGraw-Hill Companies. All rights reserved.
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