Also known as a pilonidal cyst, the condition forms when a sac of tissue fills with air or fluid in the crease of your buttocks. Pilonidal cyst, doctors say, is mostly caused by a skin infection.
Pilonidal sinus disease is a chronic condition of the natal cleft characterised by the formation of sinus tracts, cysts and abscesses driven by hair penetration and local sepsis. Surgical management ...