Several health conditions and other factors can cause toenail discoloration. Some require no treatment ... else that causes small blood vessels to break and leak blood under the toenail.

A bruised toenail, or subungual hematoma, is when the nail becomes injured from trauma (such as dropping a heavier object on ...

The blood trapped beneath the nail causes it to ... In this case, there is no need for further treatment. In a case where ...