Linearly curved, blackish macule on the wrist.

A 66-year-old woman presented with a slowly enlarging, 4×4-mm, linearly curved, blackish macule on the left wrist of 1 year’s duration. Dermoscopy revealed multiple blue-gray globules and a streak resembling ginseng. The patient underwent an arteriovenous fistula operation 9 years prior and a renal transplant 18 months prior. She had a surgical scar adjacent to the lesion and a history of hypertension and hypothyroidism. A 3-mm punch biopsy specimen was obtained.