Fistula

Peri-anal Abscess / Sinus / Fistula are caused by infection of 'anal glands' in between sphincter muscle.

  • When 'Pus' collects , it is 'Abscess'.
  • When Pus starts draining from a hole, it is 'Sinus' and
  • If it forms 'tracts' with 2 or more openings, it is 'Fistula'