Home Anal fistula Piles Anal fissure About us Feedback Contact us Overview Causes Symptoms Diagnosis Treatment Anal Fissure... Q What is Anal Fissure or Fissure-in-ano? Anal Fissure is a tear in the anus causing a painful linear ulcer at the margin of the anus. It  may cause itching, pain or bleeding. Fissures can extend upward into the lower rectal mucosa; or extend downward causing a swollen skin  tag to develop at the anal verge, also known as a sentinel pile.