The pilonidal sinus is a small opening or tunnel located in the crest at the top of the buttocks. If it gets infected, it causes pain and discomfort near the tailbone, with some people requiring abscess drainage or sinus removal.
Pilonidal Sinus - Causes, Symptoms, and Treatments
Pilonidal sinus goes unnoticed unless it is infected or causes symptoms. An infection can lead to pain and abscess. Read the article for further information.