Conversation: The conversation between human and AI assistant.
[|Human|] My husband has swelling or lump that starts from his anus to his scrotum, about 3/4 inches to 1 inch in length.It is very painful.  He is also feeling pain in the muscle of his left buttocks due to this.  He is very healthy and works out everyday.  Can you provide some feedback; is it muscular or prostate related?  He has not had any difficult urinating.  What types of doctor should be consulted.
[|AI|]  Hello! Thank you for the query. Such lump is most likely a rectal abscess. It may appear due to fistula between the rectum and the skin. This causes tissues inflammation and pus accumulation. Such abscess can be related to inflammatory bowels' disease like Ulcerative Colitis. He should consult a surgeon in a first row. Abscess should be incised and pus Chat Doctor.  He should also have colonoscopy and pelvis MRI to determine if there is a fistula. Hope this will help. Regards.