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Pilonidal Disease

Topic Overview

What is pilonidal disease?

Pilonidal (say "py-luh-NY-dul") disease is a chronic skin infection in the crease between the buttocks. People with this condition have one or more cysts in that area that tend to get inflamed and infected. A pilonidal cyst may look like a small dimple (called a "pit" or "sinus"). Hair may stick out from it.

See a picture of a pilonidal cyst.

What causes a pilonidal cyst?

Experts think pilonidal cysts may form in one of three ways:

  • A hair follicle in the skin becomes irritated or stretched. This may be caused by exercise that affects the buttocks area (such as horseback riding or cycling), tight clothing around the buttocks, heat, or heavy sweating. The hair follicle may become blocked and infected and then open into the surrounding tissue, forming an abscess. Continued exercise or walking often pulls hair into the abscess.
  • A loose hair may get trapped in the crease between the buttocks. This is more common with coarse or stiff hair. The hair can poke into the skin, especially if there is already an irritated hair follicle. Walking and exercise can pull the hair farther into the skin. A cyst then forms around the hair and can become infected.
  • Some cysts may be present at birth (congenital).

What are the symptoms?

Pilonidal disease often has no symptoms. If a cyst gets infected (called an abscess), you may have:

  • Redness or swelling.
  • Pus or blood draining from the abscess.
  • Pain when you walk or sit.

How is pilonidal disease diagnosed?

A physical exam of the buttocks is usually all doctors need to diagnose pilonidal disease. You probably won't need any other tests unless the area doesn't heal or your doctor thinks there may be another problem.

How it is treated?

Mild cases may be managed by keeping the area free of hair, such as shaving the area once a month.

If the cyst gets infected or is a problem, your doctor may need to open and drain the cyst. This procedure can be done in your doctor's office. You may get antibiotics if the infection is severe. The cyst may take a month or more to heal.

You may need to have surgery (excision) to remove the cyst. Surgery may need to be done if:

  • It gets infected again.
  • It doesn't heal after being drained.
  • Your cyst has more than one opening.

Surgery may be done at an outpatient surgical center or hospital. It may take 6 weeks or longer to heal.

Cysts can come back after being drained. Surgery works better as a permanent cure.

What can you do at home for a pilonidal cyst?

While you are being treated for an infected cyst:

  • Keep the area dry and clean. Your doctor may want you to use antibacterial soap or an alcohol swab to clean the area.
  • Shave the area if your doctor advises you to.
  • Soak in a warm tub several times a day.
  • Take nonprescription pain medicine if needed.

For cysts that are not causing symptoms or after you have had surgery to remove a cyst:

  • Keep the area dry and clean.
  • Try not to sit on hard surfaces for long periods of time.
  • Keep the area free of hair. Talk with your doctor about the best method of hair removal for you. For example, you may:
    • Shave the area.
    • Use a hair-removing lotion (depilatory), as long as the area isn't irritated.
    • Have electrolysis or laser hair removal to keep hair away longer.

Frequently Asked Questions

Learning about pilonidal disease:

Other Places To Get Help

Organization

American Society of Colon and Rectal Surgeons
85 West Algonquin Road
Suite 550
Arlington Heights, IL  60005
Phone: (847) 290-9184
Fax: (847) 290-9203
Email: ascrs@fascrs.org
Web Address: www.fascrs.org
 

The American Society of Colon and Rectal Surgeons is the leading professional society representing more than 1,000 board-certified colon and rectal surgeons and other surgeons dedicated to treating people with diseases and disorders affecting the colon, rectum, and anus.


References

Other Works Consulted

  • Marcello PW (2010). Diseases of the anorectum. In M Feldman et al., eds., Sleisenger and Fordtran’s Gastrointestinal and Liver Disease, 9th ed., vol. 2, pp. 2257–2274. Philadelphia: Saunders.

Credits

By Healthwise Staff
Anne C. Poinier, MD - Internal Medicine
C. Dale Mercer, MD, FRCSC, FACS - General Surgery
Last Revised November 11, 2013

This information does not replace the advice of a doctor. Healthwise, Incorporated disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use. How this information was developed to help you make better health decisions.

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