This hole near the base of spine is called pilonidal dimple.It is a small pit or sinus in the sacral area at the very top of the crease between the buttocks.
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.
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