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A member asked:
What's the reason why my toenails are black and blue underneath?
2 doctors weighed in across 2 answers
Rubbing in a shoe: If you are runner this is a common occurence due to pressure with the nail and the shoes. We call this runner nail. If you are a runner or not seking medical attention to have this evaluated will be a great help to prevent this from happening again and again. Go to www.Myfootandankle.Com for more information.
Answered 12/21/2017
5.3k views
Bruised...: They probably had some sort of trauma causing a bruise under the nail plate, most likely from rubbing in the shoes. This should grow out with time.
Answered 9/26/2018
4.6k views
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