A black spot under the toenail is usually caused by one of four common problems: Learn what to do below!
There are four common causes that I have seen of a black spot under the big toenail, here they are listened in order from most common to least common:
Jogger’s toe is essentially just “overuse toe”.
This is as a result of a mole!
This is different than toenail fungus- this is an bacterial infection.
If the above does not sound like your situation, consider toenail fungus as well.
Symptoms of Toenail Fungus:
Consider these other toenail color distortions: