An anal fistula — also called fistula-in-ano — is a tunnel that develops between the inside of the anus and the outside skin around the anus.
Symptoms:
Symptoms of an anal fistula can include:
An opening on the skin around the anus
A red, inflamed area around the tunnel opening
Oozing of pus, blood or stool from the tunnel opening
Pain in the rectum and anus, especially when sitting or passing stool
Fever
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