Abstract
A 40-year-old man developed multiple longitudinal pigmented streaks in his nails. His sister was also found to have a single streak on a fingernail. Neither had any history of drug ingestion or recent illness and examination failed to reveal any other signs in the skin or mucosal surfaces. A biopsy of the nail matrix at the base of one streak showed no evidence of a naevus or lentigo, the principal finding being pigmentary incontinence and excess macrophages.
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