A pilonidal cyst, sometimes called pilonidal disease, is a fluid-filled sac that usually occurs on the tailbone at the top of the buttocks. It usually starts as an infection of a hair follicle in the ...

Removal of pilonidal cyst requires experienced surgeon Dear Dr. Roach: I am writing because my son had a pilonidal cyst removed in March 2010, almost three years ago. For the first six months, I kept ...