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Our Health Library information does not replace the advice of a doctor. Please be advised that this information is made available to assist our patients to learn more about their health. Our providers may not see and/or treat all topics found herein.

Pilonidal cyst

A pilonidal cyst is a closed sac under the skin at the top of the crease of the buttocks. Pilonidal cysts usually do not cause problems unless they become infected.

The cause of a pilonidal cyst is unclear. They usually occur in men in their late teens through 20s, although they are occasionally noticed at birth as a depression or sometimes as a hairy dimple.

Symptoms of an infected pilonidal cyst (abscess) include:

  • Pain.
  • Swelling and redness.
  • Drainage of pus and/or blood.
  • Fever.

If a pilonidal cyst develops a long-lasting or frequently recurring infection, it is called pilonidal disease. Treatment includes surgical drainage or surgical removal.