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A member asked:
What causes black vertical lines under fingernails ? i am asking for a 66 yr. old male.
A doctor has provided 1 answer
Blood clots : Tiny blood clots, usually broken off from heart valves then float to the end arteries of the fingertips and get caught in the capillaries of the nail bed. They are not dangerous in and of themselves, but could be reflective of a heart problem.
Answered 11/26/2020
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