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 finger-tip (Figure 1). Dermoscopy revealed a parallel ridge pattern (Figure 2). A skin biopsy specimen was obtained and stained with hematoxylin-eosin (Figure 3).
Llamas-Velasco M, S ánchez-P érez J, Gallo E, Fraga J. Hyperpigmented Asymptomatic Macule in a Fingertip With Suspicious Dermoscopic Pattern —Quiz Case. Arch Dermatol. 2012;148(2):247. doi:10.1001/archdermatol.2011.1073a
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