Drug reaction, fixed: multilocular fixed drug reaction with extensive epidermolysis on sharply defined erosions in the area of the back of the hand and thumb.
Calcinosis cutis dystrophica: ulceration with a rock-hard, irregular base and reddened periulcerous surroundings; accumulation e.g. in systemic scleroderma
Pyoderma gangraenosum. multiple, chronically progressive, painful, large-area, blue-reddish nodules, partly with polycyclic ulcerations. characteristic is the necrotic ulcer with a painful marginal zone with walllike, undermined margins and dark red, livid erythematous border.
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