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Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

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About 75% of pilonidal sinuses occur in men, usually from the age of puberty to about 40 years of age, but rarely in older people.

Women who develop a pilonidal sinus tend to be younger. This is consistent with their earlier onset of puberty.

Patients tend to be, but are not invariably, dark, hairy, and they are often obese.

About half of patients present as acute emergencies with a pilonidal abscess.

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