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...
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