Pilonidal dimple is a condition that can occur anywhere along the crease between the buttocks, which runs from the bone at the bottom of the spine (sacrum) to the anus.
Pilonidal dimple may appear as:
A pilonidal abscess
, in which the hair follicle becomes infected and pus collects in the fat tissue
A pilonidal cyst
, in which a cyst
or hole forms if there has been an abscess for a long time
A pilonidal sinus, in which a tract grows under the skin or deeper from the hair follicle
A small pit or pore in the skin that contains dark spots or hair
Pilonidal abscess; Pilonidal sinus; Pilonidal cyst; Pilonidal disease
Symptoms may include:
Pus may drain to a small pit in the skin
Tenderness over the area after you are active or sit for a period of time
Warm, tender, swollen area near the tailbone
There may be no symptoms other than a small dent (pit) in the skin in the crease between the buttocks.
The cause of pilonidal disease is not clear. It is thought to be caused by hair growing into the skin in the crease between the buttocks.
This problem is more likely to occur in people who:
It may help to keep the area clean and dry and remove hair regularly to prevent infection.
Call your health care provider if
Call your health care provider if you notice any of the following around the pilonidal cyst:
Drainage of pus
What to expect at your health care provider's office
You will be asked for your medical history and given a physical examination
. Sometimes you may be asked for the following information:
- Has there been any change in the appearance of the pilonidal cyst?
- Has there been any drainage from the area?
- Do you have any other symptoms?
Rarely, a CT scan
Pilonidal disease that causes no symptoms does not need to be treated.
A pilonidal abscess may be opened, drained, and packed with gauze. Antibiotics may be used if there is an infection spreading in the skin or you also have another, more severe illness.
Other surgeries that may be needed include:
Stafford SJ, Klein MD. Pilonidal sinus and abscess. In: Kliegman RM, Behrman RE, Jenson HB, Stanton BF, eds. Nelson Textbook of Pediatrics. 19th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 336.6.
Nelson H, Cima RR. Anus. In: Townsend CM Jr, Beauchamp RD, Evers BM, Mattox KL, eds. Sabiston Textbook of Surgery. 18th ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 51.
Humphries AF, Duncan JE. Evaluation and management of pilonidal disease. Surg Clin North Am. 2010;90:113-124.
Linda J. Vorvick, MD, Medical Director, MEDEX Northwest Division of Physician Assistant Studies, University of Washington, School of Medicine; Susan Storck, MD, FACOG, Chief, Eastside Department of Obstetrics and Gynecology, Group Health Cooperative of Puget Sound, Bellevue, Washington; Clinical Teaching Faculty, Department of Obstetrics and Gynecology, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.