subungual hematoma(redirected from Nail trephination)
sub·un·gual he·ma·to·ma(sŭb-ŭng'gwăl hē'mă-tō'mǎ)
Collection of blood beneath a fingernail or toenail, usually due to trauma.
A collection of blood under the nail as a result of trauma. This condition may be treated by heating the end of a paper clip and then placing its point against the nail, which permits a small hole to be melted painlessly in the nail and allows the trapped blood to escape.