Pilonidal (say "py-luh-NY-dul") disease is a common skin condition. It usually develops at the top of the crease between the buttocks. It may look like a small hole or dimple called a pit. Loose hair and skin debris trapped there can cause an infection or an abscess. It's also called a pilonidal cyst.
You may have no symptoms. But if the cyst gets infected, you may have redness or swelling in the area. You may also have a fever. You may have cloudy fluid or blood draining from the cyst. Some people may find it hard to walk or sit because of the pain.
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.
While you are being treated for an infected cyst:
For cysts that are not causing symptoms or after you have had surgery to remove a cyst:
Keeping the area free of hair may also help. Talk with your doctor about what they recommend.
Call 911 anytime you think you may need emergency care. For example, call if:
Call your doctor now or seek immediate medical care if:
Watch closely for changes in your health, and be sure to contact your doctor if:
©2011-2025 Healthwise, Incorporated