PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY
Bruised fingernail. Blood under a patient's fingernail, caused by an injury. This condition, also known as a subungual haematoma, occurs when blood vessels beneath the nail rupture. In most cases the blood drains away after a few days, but occasionally it needs to be lanced and drained surgically.
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