Black or Blue Toenails
A nail that has become black or blue is usually the result of a direct form of trauma, such as dropping a heavy object on the toe, or repetitive stress, such as running. In simple terms, a black or blue nail is one that has been bruised.
The hallux (big toe) is most commonly affected and may be extremely painful depending on severity.
Signs and Symptoms
- Blue or black nail
- Pain with pressure