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Anal fissure

An anal fissure is a tear or ulcer (open sore) that develops in the lining of the anal canal.
Treating anal fissure
Like other small cuts or tears to the skin, an anal fissure will often heal by itself within a few weeks.
Preventing anal fissure
It is not always possible to prevent anal fissures, but you can reduce your risk by taking steps to avoid becoming constipated.