Black nail (subungual hematoma) is a straightforward nail-bed injury manifested by pain and dark red to black discoloration of the nail bed. Black nail is the result of blunt trauma or crush injury to the nail followed by bleeding from an underlying vessel. The nail bed is vulnerable to injury due to its rich vascular supply and its position between the tough nail and hard bone (the distal phalanx). Black nail is also referred to as subungual hematoma, meaning a collection of blood (hematoma) beneath ...

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