Pilonidal sinuses of the anal canal.
D000038:Abscess / Q000209:etiology; D000328:Adult; D001004:Anus Diseases / Q000209:etiology; D006801:Humans; D008297:Male; D010864:Pilonidal Sinus / Q000150:complications / Q000209:etiology*; D012003:Rectal Fistula / Q000150:complications