A subungual hematoma, sometimes called runner's toe or tennis toe, is a collection of blood under a fingernail or toenail.
CAUSES
This condition is caused by an injury to the finger or toe that causes a blood vessel beneath the nail to break. It can develop after a direct blow to a finger or toe or after repeatedly putting pressure on an injured finger or toe.
SYMPTOMS
Blue or dark blue skin under the nail.
Pain or throbbing in the injured area.
DIAGNOSIS
This condition is diagnosed with a medical history and a physical exam.
TREATMENT
Usually treatment is not needed for this condition. It usually goes away with time. If the condition is causing a lot of pain, a health care provider may perform a painless procedure