Black nail is very common.
It's caused by acute trauma, most commonly jamming a finger or thumb in a door, stubbing a toe - or when the wrong sort of nail gets hit with a hammer.
Subungual means 'under the nail', haematoma means bruise.
As with all bruises in time it will disappear.
Sometimes the nail will fall off because of the damage but it usually grows back.
When the build up of pressure under the nail causes pain, making a small hole in the nail relieves it.
The doctor or chiropodist can do this.
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