Infection of the base of the nail bed, often quite painful as the pus is trapped by the nail.
Wet hands or hands in rubber gloves.
Acute: usually S. aureus.
May need to be drained, heating a paper clip red hot and sticking it into the abscess though the nail is said to be efficacious. And I bet it really stinks.
Chronic: get cultures.
ICD9 Codes (Soon to be supplanted by ICD10)
Paronychia 681.9; candidal (chronic) 112.3; chronic 681.9; finger 681.02; toe 681.11.