A pilonidal sinus is a pocket or a small cyst in the skin which generally develops near the tailbone, the top of the cleft of the buttocks. The word pilus means hair and nidal means nest. When a nest ...
It often starts as a sore spot you assume is a zit, ingrown hair, or minor irritation. Then it gets worse. Sitting becomes uncomfortable. Pressure builds. Sometimes there’s swelling, drainage, or even ...