Pilonidal dimple

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Anatomical landmarks, back view

Pilonidal cyst and dimple

Pilonidal dimple is a small pit or sinus in the sacral area at the very top of the crease between the buttocks.

Sacral dimple

The majority of pilonidal dimples are harmless, congenital anomalies that consist of a small depression or pit. There may be increased hairiness around the area.

The pilonidal dimple may also be a deep tract, rather than a shallow depression, leading to a sinus that may contain hair. These can become infected and drain. On rare occasions, the sinus may extend into the spinal cord.

During adolescence, the pilonidal dimple or tract may become infected, forming a cyst-like structure called a pilonidal cyst. These may require surgical drainage or total excision to prevent reinfection.

• Congenital pilonidal dimple
• Congenital dermal sinus (of which the dimple is the mildest form)

Review Date: 05/03/2006
Reviewed By: Michael S. Lehrer, MD, Department of Dermatology, University of Pennsylvania Medical Center, Philadelphia, PA. Review provided by VeriMed Healthcare Network.