5. Anal fistula
It is a small tunnel that originates from an opening inside the anal canal and ends in an outer opening near the anus. Up to 50% of people with an abscess develop a fistula. However, a fistula can also occur without an abscess. Fistulas are consequences of the blockage of the exit of an anal gland, so an abscess is formed and breaks the skin of the perianal area.
It establishes an anomalous connection with the internal surface of the anal canal and through which It can be left to produce stool. They do not cause pain, except in cases where the abscess that originates it is recurrent, but irritation or itching due to the pus they exude.