Going to a Cleveland Clinic location? This common type of cyst is located in the crease of the buttocks and is usually caused by a skin infection. Pilonidal cysts are a common condition, with more than 70, cases reported in the U. A pilonidal cyst is a round sac of tissue that's filled with air or fluid.
Anal or Rectal Abscess: Symptoms, Causes, and Treatment
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Perianal abscess is a superficial infection that appears as a tender red lump under the skin near the anus. The infection occurs when bacteria gets trapped in the crypt glands that line the anal canal. This type of abscess happens most often in male babies under a year of age. It may drain pus on its own and then heal and disappear.
Learn more. If one of these glands becomes clogged, it can get infected, and an abscess can develop. An anorectal abscess is a collection of pus under the skin in the area of the anus and rectum.