Hello this is my first time here.Following years of ulcerative colitis and no response to medication had total colectomy 1st of 3 ops 4 weeks ago. Have colostomy bag. In hosp 14 days. Although had white/red bloody mucous whilst in hosp was told this is normal. 21st day post op discharged from back passage black shiny tar substance. Happened again last night. Feeling okay otherwise. Has anyone experienced this and is it normal?