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A 23-year-old female asked:

I recently took my toe nail polish off after a couple weeks and found one of my big toes had a black spot. is it a fungus or a bruise?

1 doctor answer1 doctor weighed in
Dr. Li-Yu Mitchell
Family Medicine 22 years experience
Most likely bruise: Nail trauma is common, whether from repetitive impact from running or just bumping into something . Fungal infections of the nail tend to be associated with yellowish, thickened nails. A dark spot on your nail that doesn't improve over a few weeks should be examined by a doctor to rule out the fairly rare nailbed melanoma.

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Last updated Dec 6, 2017

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