Abscess

Abscess: An abscess is a local accumulation of pus anywhere in the body. The following are some examples: a skin abscess is a common boil, a peritonsillar abscess is a persistent collection of pus behind the tonsils, and a perianal abscess is a pool of pus that forms next to the anus, often causing considerable tenderness and swelling in that area and pain on sitting down and on defecating.