What is the medical term meaning abnormal collection of blood under a fingernail or toenail?

Answer 1

A subungual hematoma is blood trapped under a nail. By the next day, it has the characteristic black or very dark blue appearance. It's the familiar "black nail" after whacking your finger with a hammer, for instance. Getting attention within hours of the accident can reduce pain and swelling; after the blood clots, however, the affected person just needs to wait until the swelling goes down naturally.

Answer 2

The medical term for an abnormal collection of blood under a fingernail or toenail is called a subungual hematoma. It is usually caused by trauma or injury to the nail bed.