A member asked:

Son has horseshoe shaped brown on or under thumbnail only on one nail doesn't hurt/goes down the nail further as nail grows what could this be?

A doctor has provided 1 answer

Likely blood clot: It is likely a blood clot under the nail from some trauma. It will likely go away as the nail grows since it has been moving toward the tip of the nail.

Answered 1/26/2015

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