What Is a Pilonidal Sinus? A Complete Guide

A pilonidal sinus is a small hole or tunnel in the skin, usually located near the tailbone at the top of the buttocks. This condition often contains hair, dirt, and debris, and can lead to painful infections or abscesses if left untreated. Though more common in young men and people who sit for long periods, anyone can develop a pilonidal sinus. The condition typically starts as a small dimple or swelling and can progress into a painful cyst or abscess that drains pus or blood. Common symptoms include pain while sitting or walking, swelling near the tailbone, and foul-smelling drainage from the opening. Infected pilonidal sinuses may cause fever and require prompt medical attention. The exact cause of a pilonidal sinus isn't always clear, but it is often linked to ingrown hairs and friction in the area. Risk factors include obesity, sedentary lifestyle, excessive body hair, and poor hygiene. If not treated early, it can become a recurring problem, causing long-term discomfort and...