An anal fissure (AY-nul FISH-er) is a tear in the anus causing a painful linear ulcer at the margin of the anus. An anal fissure, also known as fissure-in-ano, may cause itching, pain or bleeding. Fissures can extend upward into the lower rectal mucosa; or extend downward causing a swollen skin tab or tag to develop at the anal verge, also known as a sentinel ...
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