2 doctors weighed in:

What are dark lines in my finger nails?

2 doctors weighed in
Dr. Morris Westfried
Dermatology
1 doctor agrees

In brief: Pigment

Thisispigment from a mole qt base of nail.
If there're multiple this is family charcteristic. However if there is only one it coukd rarely be a sign of a melanoma under the nail. That diagnosis requires a biopsy.

In brief: Pigment

Thisispigment from a mole qt base of nail.
If there're multiple this is family charcteristic. However if there is only one it coukd rarely be a sign of a melanoma under the nail. That diagnosis requires a biopsy.
Dr. Morris Westfried
Dr. Morris Westfried
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