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A member asked:
There is a dark-brown line on the nail of my thumb which goes from the root of the nail to the end and is around 1mm in width. what could this be?
A doctor has provided 1 answer
Blood clot is likely: Blood clot as a result of trauma to the finger is a common cause; However an exaination by your doctor will help rule out other possibilities;
Answered 9/16/2014
3.7k views
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