Rubor, dolor, calor, tumor around the anus. May be a source for Fourniers.
Diabetes, neutropenia, trauma, (insert you least favorite political affiliation here).
Cold steel in the hands of a steady surgeon, is probably is curative, but a 7 - 10 day course of cephalexin OR dicloxacillin for staph infections or, if mixed infection, amox/clav alone OR (TMP/Sulfa OR quinolone PLUS metronidazole OR clindamycin) OR (amoxicillin PLUS metronidazole OR clindamycin).
If ill enough to be admitted, third generation cephalosporins PLUS metronidazole. Alternatives include a carbapenem OR penicillin/beta-lactamase inhibitors OR a quinolone PLUS metronidazole OR clindamycin.
ICD9 Codes (Soon to be supplanted by ICD10)
perineal (superficial) 682.2; deep (with urethral involvement) 597.0.