A pilonidal sinus is a small hole or tunnel in the skin that develops in the crease of the buttocks. It's a benign inflammatory condition of the hair follicles that's not associated with cancer.
Symptoms of a pilonidal sinus include:
1. A small dimple
2. Irritation
3. A large painful mass
4. Fluid drainage from the affected area
5. Redness and tenderness of the area
6. Foul-smelling drainage
7. Fever, nausea, or feeling ill
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