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A member asked:
I have a question about my left thumbnail.there is a brown line under there for up to a year now and it has not grown in size but it begins from the cuticle and ends at the tip. please help, i don't want to get a nail biopsyu because i don't think it is n
A doctor has provided 1 answer
Dermatologist: A brownish/black discoloration to the nail bed is known generally as longitudinal melanonychia. There are several reasons for this line such as vitamin deficiencies, trauma, medication side effects and most importantly, subungual melanoma. Due to the fact that this is extending to your cuticle and since your thumb is involved, you really should get this checked out by a dermatologist.
Answered 6/26/2015
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