1. Perianal fistula.
Perianal fistula is caused by contamination from an opening in the anal canal at the level of the anal sphincters (anal orifice of the fistula). The infection extends into tissue around anus and appears at the skin as a red and painful bulge containing pus (abscess). The pus must be surgically removed. The anal orifice which caused the inflammation is not treated and the inflammation may reappear. Most often, some pus coming out the surgical site of drainage is seen (anal fistula).
Hydradenitis (Verneuil’s disease) is an inflammation of skin glands around the anus. Hydradenitis does not communicate with anal canal. However the skin inflammation extends laterally and can cause many skin orifices. Smoking is a contributing factor. Permanent healing can be achieved by total resection of inflamed tissues .
Anal fistula- perianal abscess Athens Proctologist