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A member asked:
What are these black line on top of my finger nails?
A doctor has provided 1 answer
Fingernail Dark Line: Melanonychia is brown or black pigmentation of the nail unit. Melanonychia commonly presents as pigmented band arranged lengthwise along the nail unit, and this presentation is known as longitudinal melanonychia (lm) or melanonychia striata. The most concerning cause of melanonychia is subungual melanoma, although a variety of other causes exist. See your dermatologist asap.
Answered 4/24/2014
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