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Summer 2006, Vol. 14 No. 2

Hong Kong J. Dermatol. Venereol. (2006) 14, 98-99


Dermato-venereological Quiz

Dermato-venereological Quiz

YH Chan 陳耀海 and KC Yau 游高照

Abstract
A 45-year-old gentleman presented with asymptomatic hypopigmented lesions over both of his forearms for 4 years. The lesions started as a small white macules and increased in size gradually. Physical examination showed symmetrical hypopigmented patches over both of his forearms. These patches are made up of serpiginous streaks of hypopigmented macules with atrophic surface and there are intralesional violaceous discoloration and postinflammatory hyperpigmentation (Figures 1 & 2). Incisional skin biopsy was performed over the left forearm lesion and histopathological examination showed compact orthokeratosis, flattening of rete ridges and focal vacuolar alteration of the basal layer. There was mild homogenization of collagen bundles in the upper dermis and patchy perivascular lymphohistiocytic infiltration with scattered melanophages. No epidermal dysplasia is evident (Figures 3 & 4).