Pediatric Surgeon, Laparoscopic Surgeon
MBBS, FCPS, FEBPS, FACS, Dip.MAS
A pilonidal sinus (PNS) is a small hole or tunnel in the skin. It may fill with fluid or pus, causing the formation of a cyst or abscess. It occurs in the cleft at the top of the buttocks. A pilonidal cyst usually contains hair, dirt, and debris. It can cause severe pain and can often become infected.