Abscess - anorectal
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Abscess - anorectal


An anorectal abscess is a collection of pus in the anal or rectal region.

Alternative Names

Anal abscess; Rectal abscess; Abscess - anorectal


Infection of an anal fissure, sexually transmitted infections, and blocked anal glands are common causes of anorectal abscesses. Deep rectal abscesses may be caused by intestinal disorders such as Crohn's disease or diverticulitis.

The following factors increase your risk for an anorectal abscess:

  • Diabetes
  • A weakened immune system
  • Engaging in anal sex
  • Inflammatory bowel disease (Crohn's disease and ulcerative colitis)

The condition may occur in infants and toddlers who are still in diapers and who have a history of anal fissures. The abscess often appears as a swollen, red, tender lump at the edge of the anus. The infant may be fussy from discomfort, but there are generally no other symptoms.


  • Painful, hardened tissue in the perianal area
  • Discharge of pus from the rectum
  • Lump or nodule, swollen, red, tender at edge of anus
  • Fever
  • Pain associated with bowel movements
  • Constipation (may occur)

Exams and Tests

A rectal examination may confirm that you have an anorectal abscess. A proctosigmoidoscopy may be done to rule out other diseases.


Treatment involves draining the abscess. If the abscess is very deep, you may need surgery to have this done.

Warm sitz baths (sitting in a tub of warm water) may help relieve pain and swelling, and may help make the abscess easier to drain.

Your doctor may prescribe pain medication and antibiotics.

Outlook (Prognosis)

With prompt treatment, a patient usually does well. Infants and toddlers usually recover very quickly.

Possible Complications

  • Systemic infection
  • Anal fistula formation
  • Recurrence
  • Scarring

When to Contact a Medical Professional

Call your health care provider if you notice a rectal discharge, symptoms of an anorectal abscess develop. You should also call if you have fever, chills, or other new symptoms after being treated for this condition.


Prevention or prompt treatment sexually transmitted diseases may prevent this cause of anorectal abscesses. Use condoms during intercourse, including anal sex, to prevent such infections.

Frequent diaper changes and proper cleaning during diaper changes will help prevent both anal fissures and perianal abscesses in infants and toddlers.

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