Chronic nail pigmentation in a 50-year-old woman.

摘要

A 50-year-old white woman presents with subungual and acrai pigmentation of the left middle finger. She first noticed a black streak down the middle of her nail 10 years prior to presentation. Subsequently, the pigmented band on the nail plate wid-ened and darkened, with pigment spread-ingto the proximal nail fold and distal ac-ral hyponychial skin. She has no associated symptoms, including nail splitting, bleeding, or pain, and nohistory of acute or recurrent trauma. Several years previously, she was reassured that her nail pigmentation was benign. The nail examination is illustrated in the Figure. Examination of all other nails is unremarkable. Past medical history and family history are unrevealing.