U.S. doctors online nowAsk doctors free
South Africa
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.
Dr. Carlo Contreras
A Verified Doctoranswered
A US doctor answeredLearn more
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.
Dr. Joseph Mele
Plastic Surgery 32 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.

90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more. Get help now:

Ask doctors free
Educational text
Free
Talk to a doctor
24/7 visits - just $39!
50% off with $15/month membership

90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more. Get help now:

Ask doctors free
Educational text
Free
Talk to a doctor
24/7 visits - just $39!
50% off with $15/month membership
Last updated Sep 1, 2020

Disclaimer:

Content on HealthTap (including answers) should not be used for medical advice, diagnosis, or treatment, and interactions on HealthTap do not create a doctor-patient relationship. Never disregard or delay professional medical advice in person because of anything on HealthTap. Call your doctor or 911 if you think you may have a medical emergency.