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An anal abscess is a painful condition in which a collection of pus develops near the anus. Most anal abscesses are a result of infection from small anal glands. An anal, or rectal, abscess occurs when a cavity in the anus becomes filled with pus. It causes extreme pain, fatigue, rectal discharge, and fever. An anal abscess is a painful condition in which a collection of pus develops near the anus. Most anal abscesses are a result of infection from small anal glands. A perirectal abscess is a collection of pus in the deep tissues surrounding the anus. By contrast, a perianal abscess is a shallower collection of pus under the skin surrounding the anus however, both are sometimes described as an anal abscess. Anal abscesses are not uncommon but since they are often spontaneously resolved, not all patients seek medical intervention. An anal abscess is a pus-filled cavity that is caused by infection of the cryptoglandular tissue of the anal canal. Anorectal abscess (also known as an analrectal abscess, or perianalperirectal abscess) is an abscess adjacent to the anus. Most cases of perianal abscesses are sporadic, though there are certain situations which elevate the risk for developing the disease, such as diabetes mellitus, crohns disease, chronic corticosteroid treatment and others. Ischiorectal, inter- and intrasphincteric abscesses have been described. A fistula can be present with or without an abscess and may connect just to the skin of the buttocks near the anal opening. Anal abscess (perianal abscess, perirectal abscess) is an infected cavity and collection of pus around or inside the anus. Some are more complex than others depending on the location of the abscess in relation to the anus and the sphincter muscles figure 1.