A female asked:
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why is there a vertical black line on my right big toenail?

3 doctor answers
Dr. Jonathan Posner
26 years experience Podiatry
Trauma: A dark line that runs vertically down the nail can indicate that you might have traumatized the nail matrix(the area where the nail starts growing). Other possibilities are fungus, melanoma and genetics. See your doc for a full evaluation.
Answered on Mar 25, 2020
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4 thanks
Dr. Frank Smith
28 years experience Podiatry
Usually genetic : Melanonychia striata is a possibility would need a picture also may have just damanged the nail root and could be scar changes that originate at the root level . I would get it check by a podiatrist.
Answered on Sep 12, 2018
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1 thank
Dr. Emily Altman
27 years experience Dermatology
Black stripe nail: This could be a mole or freckle in growth center of the nail (matrix), fungal infection of the nail & a melanoma under the nail. Needs a diagnosis. Melanoma is a dangerous skin cancer that needs to be diagnosed & treated as soon as possible to have better chances of a cure. If this is a new pigmented streak, if it is changing (darker, wider, more irregular), please see a dermatologist asap.
Answered on Sep 12, 2018
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1 thank

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Related questions:

A 21-year-old female asked:
Dr. Jeffrey Bowman
37 years experience Podiatry
Likely: A fungus but i would still get it checked. Not to scare you but I have seen melanoma in toenails. Play it safe.
A 41-year-old male asked:
Dr. Jeffrey Hoffman
31 years experience Family Medicine
Recommend consult: consider seeing a dermatologist about this to be sure this is not anything more problematic
1
1 thank
A 38-year-old female asked:
Dr. Ashley Vanderloop
12 years experience Podiatry
Nail discoloration: Dark lines across the nails most commonly are from either trauma or fungus. As long as it is healing he should be fine... if you are concerned, a pic ... Read More
A 24-year-old female asked:
Dr. Jeffery VanYperen
11 years experience Podiatry
Microtrauma: It sounds like your toenails are hitting the end of your shoe. This usually happens if the toe box is either too small (toe is pressed up against the ... Read More
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