Bleeding under the nailbed leads to subungual hematomas, which cause pain and discoloration. This damage typically results from a crush or blow injury to the finger, such as getting a finger stuck in a door.
In many cases, subungual hematomas resolve on their own. Sometimes, the blood building up under the nail causes severe pain and requires trephination: the doctor makes a small hole in the nail to relieve the pressure.

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