A member asked:

Tumb finger have a dark colour line down the centre, what cause this?

A doctor has provided 1 answer
Dr. Geoffrey Rutledge answered

Specializes in Internal Medicine

Lines on nail?: Sometimes minor trauma to the thumb can cause bleeding at the base of the nail - this can lead to a line forming on the nail as it grows.

Answered 3/12/2014

5.2k views

Thank

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