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 ...

According to the American Society of Colon and Rectal Surgeons, Pilonidal disease is a chronic skin infection that affects about 70,000 people in the United States annually. While the cause is not ...