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A 45-year-old female asked:

I have a dark vertical black line on my left thumb nail. is it melanoma?

3 doctor answers5 doctors weighed in
Dr. Michael Dugan
Specializes in Hematology
Not likley: Melanomas are not linear. I suppose you could have a melanoma under the nail, but i still do not think it would look linear.
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Dr. Carlo Contreras
A Verified Doctoranswered
Surgical Oncology 19 years experience
Unlikely: Melanoma under the nail usually runs horizontally, or the width of the nail, and not vertically.The parents of melanoma can vary quite a bit between patients, so if you are still worried or the black area does not appear to grow out of the nail you should visit your doctor for a complete examination.
Created for people with ongoing healthcare needs but benefits everyone.
Dr. Joseph Mele
Plastic Surgery 33 years experience
Maybe?: Most likely a buise or injury; however, do not take a risk. Get checked out by a board certified dermatologist. If it is a melanoma, the sooner it is treated the better. Can't tell for certain without an examination.
Created for people with ongoing healthcare needs but benefits everyone.
Last updated Sep 1, 2020

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