Abstract
A 37-year-old man presented with a brownish-black nail on the great toe of the right foot. A darkly pigmented linear patch had started to form within the toenail 4 years earlier and had widened and darkened over time. Two months before the current presentation, the dark pigment had begun to involve the hyponychium and the proximal and lateral nail folds. The patient's personal and family medical histories were otherwise unremarkable. The results on routine laboratory testing were within normal limits. An incisional biopsy of the nail matrix showed atypical melanocytes and inflammatory cells along the basal layer of the epidermis, . . .
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