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Quiz Case

Hyperpigmented Asymptomatic Macule in a Fingertip With Suspicious Dermoscopic Pattern

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A previously healthy 51-year-old man presented with asymptomatic brown-pigmented lesions on his first left-hand fingertip. The lesions had appeared 3 months ago and gradually spread. He had no history of tobacco smoking, wearing rings, chemotherapy, or work involving friction or in wet places.

On physical examination we found an ill-defined, golden to light-brown patch over the left thumb fingertip (Figure 1). Dermoscopy revealed a parallel ridge pattern (Figure 2). A skin biopsy specimen was obtained and stained with hematoxylin-eosin (Figure 3).

See the full article for an explanation and discussion.

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Ashish Bhatia, MD, Web Editor, Archives of Dermatology.

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