A fistulotomy is the surgical opening of a fistulous tract. This species is principally distinguished by the fistulous or perforated peripheral tubercles. Exploration of fistulous opening into the soft tissues of neck. This is compared with fistulotomy, where the fistulous tract is merely laid open to heal. The internal bumper may become entirely buried within the fistulous tract. The fistulous track is removed with skin and cartilage. Lick granulomas sometimes become infected with bacteria, causing abscessed areas or fistulous tracts (furuncles). The entire fistulous tract, along with a small rim of rectal mucosa is incised.