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 ...
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That painful bump near your tailbone isn’t a pimple—what you need to know about pilonidal cysts
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 ...
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