It consists of some tubular interconnections between the anal channel and the tegument as a result of an undrained abscess or incomplete surgical drainage.

What are the characteristic symptoms?

Constantly mucus secretion which marks the linen or even pus or blood through small holes within the tegument around the anus.

Which is the treatment?

The fistula route must be completely opened in order to allow a correct drainage. In severe cases the treatment is surgical.