common

Pilonidal sinus

Pilonidal disease is a type of skin that typically occurs as a cyst between the cheeks of the buttocks and often at the upper end. Symptoms may include pain, swelling, and redness. There may also be drainage of fluid, but rarely a fever.

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Symptoms — what it feels like

·Pain, swelling, redness, drainage of fluid

Causes — why it happens

·Ingrown hair in the natal cleft

How it's found

·Based on symptoms and examination

Prevention

·Shaving the area

Treatment

·Incision and drainage, surgical removal

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Plain-language summary adapted from Wikipedia. Not medical advice.