Anal fissure abscess or fistula

Skip to main content. Most fissures heal on their own within weeks. Stay up-to-date on the latest content and resources. Anal fistula - An anal fistula is an abnormal narrow tunnel-like passageway, which is the remnant of an old anal abscess after it has drained. Occasionally, rectal bleeding or urinary symptoms, such as trouble initiating a urinary stream or painful urination, may be present. Thrombosed external hemorrhoid - Usually this will slowly disappear on its own. Read, M.