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Pilonidal sinus

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Introduction
A pilonidal sinus is a small hole or "tunnel" in the skin. It usually develops at the top of the cleft of the buttocks, where the buttocks separate.
Symptoms of a pilonidal sinus
A pilonidal sinus is a small hole or channel in the skin that most commonly occurs at the top of the cleft between your buttocks.
Causes of a pilonidal sinus
The exact cause of pilonidal sinuses is unclear. It is generally thought that they are caused by loose hairs that get pushed into the skin.
Treating a pilonidal sinus
Surgery is used if a pilonidal sinus becomes infected. If there is no infection, treatment may not be necessary.
Complications of a pilonidal sinus
Find out what complications can occur as a result of surgery for a pilonidal sinus, such as the pilonidal sinus returning or an infection at the wound site.