A pilonidal sinus is a small hole or tunnel in the skin, typically in the cleft at the top of the buttocks, that can become infected and develop into a painful abscess or cyst containing hair, debris, ...
A pilonidal sinus is a small tunnel that develops at the top of the crease in the buttocks. Trapped hair around the buttocks crease can lead to an abscess, and a pilonidal sinus may develop as a ...
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