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. Anal abscess causes perirectal and perianal abscesses are thought to develop from the glands surrounding the anus on occasion, perianal abscesses may develop from infected skin adjacent to the anus. The primary cause of the anal abscess is an infection which may be contracted in a number of different ways including sexual intercourse or postoperative infection. Common aerobic and anaerobic bacteria such as escherichia coli, clostridium, bacteroides fragilis, staphylococcus aureus, and streptococcus are usually responsible. The term anal abscess is frequently used describe any abscesses in the deep tissue surrounding the abscess (also termed a perirectal abscess) and in skin surrounding the anus (termed perianal abscess). However, both have essentially the same signs and symptoms although the perirectal abscess has more severe symptoms. The signs and symptoms of an anal abscess may include one or more of the. 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. What you need to know the annual incidence of perianal abscess is estimated between 14 000 and 20 000 people in the uk, resulting in about 12 500 operations in the nhs each year. 1 a recent swedish cohort study estimated the incidence at 16. 2 the true incidence may be higher, since many patients are treated with antibiotics in the community and some abscesses spontaneously. If the abscess grows larger, it may result in a ruptured abscess in dogs face. For more we recommend reading our article about, my dog wont eat - causes. Perianal abscess in dogs anal gland abscesses in dogs produce a painful inflammation, usually on one side of the anus, affecting one of the anal glands. 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.