Pilonidal sinus disease is an inflammatory condition involving the hair follicles 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. The disease is benign and has no association with cancer.
Pilonidal dimple may appear as:
Pilonidal abscess; Pilonidal sinus; Pilonidal cyst; Pilonidal disease
Symptoms may include:
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:
Wash normally and pat dry. Use a soft bristle scrub brush to prevent the hairs from becoming ingrown. Keep the hairs in this region short (shaving, laser, depilatory) which may decrease the risk of flare-ups and recurrence.
Call your health care provider if you notice any of the following around the pilonidal cyst:
You will be asked for your medical history and given a physical examination. Sometimes you may be asked for the following information:
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:
Kliegman RM, St. Geme JW, Blum NJ, Shah SS, Tasker RC, Wilson KM. Surgical conditions of the anus and rectum. In: Kliegman RM, St. Geme JW, Blum NJ, Shah SS, Tasker RC, Wilson KM, eds. Nelson Textbook of Pediatrics. 21st ed. Philadelphia, PA: Elsevier; 2020:chap 371.
Sell NM, Francone TD. Management of pilonidal disease. In: Cameron AM, Cameron JL, eds. Current Surgical Therapy. 13th ed. Philadelphia, PA: Elsevier; 2020:335-341.
Surrell JA. Pilonidal cyst and abscess: current management. In: Fowler GC, ed. Pfenninger and Fowler's Procedures for Primary Care. 4th ed. Philadelphia, PA: Elsevier; 2020:chap 31.