Pilonidal disease is a condition that can occur anywhere along the crease between the buttocks, which runs from the bone at the bottom of the spine (sacrum) to the anus.
Pilonidal disease may appear as:
- A pilonidal abscess, in which the hair follicle becomes infected and pus collects in the fat tissue
- A pilonidal cyst, in which a cyst or hole forms if there has been an abscess for a long time
- A pilonidal sinus, in which a tract grows under the skin or deeper from the hair follicle
- A small...