PMC5465673_01
Well-defined brownish hyperkeratotic plaque with an erythematous rim located on the right lateral malleolus.
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Physical examination revealed bilateral well-defined brownish hyperkeratotic plaques with an erythematous rim located on both lateral malleoli (Fig. 1).
Histopathological findings revealed papillated psoriasiform epidermal hyperplasia, compact hyperkeratosis, and mounds of parakeratosis with neutrophils. There was absence of a granular layer, with pale and vacuolated keratinocytes in the superficial epidermal layer and scattered necrotic keratinocytes. Hematoxylin-eosin. Original magnification x100.
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Extravasated erythrocytes with dilated capillaries in the papillary dermis were also observed (Fig. 2, Fig. 3).