A pilonidal cyst is a closed sac under the skin at the top of the crease of the buttocks. Pilonidal cysts usually do not cause problems unless they become infected.
Symptoms of an infected pilonidal cyst (abscess) include:
If a pilonidal cyst develops a long-lasting or frequently recurring infection, it is called pilonidal disease. Treatment includes surgical drainage or surgical removal.
eMedicineHealth Medical Reference from Healthwise
To learn more visit Healthwise.org