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A 20-year-old female asked:

Is black vertical line on toenail contagious? i worry if i can get it from someone who has it. is it caused by fungus or bacterial infections?

1 doctor answer2 doctors weighed in
Dr. Heidi Fowler
Psychiatry 26 years experience
Melanonychia Striata: Melanonychia striata is a brown-black lines in the nail the goes from the base to the tip of the nail. Get it checked just to make sure it isn't related to a malignancy

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