A 67-year-old female asked:
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I have a dark brown vertical line on my right thumbnail. What could this be? Melanoma?

1 doctor answer
Dr. Richard Orr
43 years experience in Surgical Oncology
Maybe: Definitely have it checked out. You can start with a primary doc, but you may need to see a dermatologist. Here are some examples http://www.Dermnet.Com/images/nail-melanoma/.
Answered on Nov 25, 2012

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See below: Visit this site for into on this topic: https://www.medicalnewstoday.com/articles/320687.php
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Nail lines: Any lines running through a nail should be biopsied. Go see a dermatologist if it's your thumbnail.

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