A Pilonidal sinus is a tract, small cyst or abscess that occurs in the cleft of the buttocks. It can cause severe pain and often becomes infected. What Are The Causes Of Pilonidal Sinus Disease ? Causes of Pilonidal sinus is believed to be chiefly bifactional Seen in hirsute (hairy individuals) individuals with potential for free hair to lie within the natal cleft Presence of pits/dimples within the natal cleft area that promote the entrance of loose hair/debris into the subcutaneous tissue How Are Pilonidal Sinus Treated? Once a pilonidal sinus has been definitely identified, surgery is the treatment of choice. Sometimes if this condition manifests with an abscess formation, then a procedure to drain the abscess will be required as a pre – requisite. Occasionally abscess drainage alone may suffice. Surgery is done under General Anathesia where the entire diseased complex is excised. Primary closure of this wound is almost always done (no regular dressings required as there is no