It has been postulated that hair penetrates into the subcutaneous tissues through dilated hair follicles, which is thought to occur particularly in late adolescence, though follicles are not found in the walls of cysts. A sinus develops with a short tract, with a not clearly understood suction mechanism involving local anatomy, eventually leading to further penetration of the hair into the subcutaneous tissue.
The initial treatment for an infected pilonidal cyst is usually a procedure that can be performed in your doctor's office. After numbing the area with an injection, your doctor makes a small incision to drain the cyst. If the cyst recurs, which often happens, you may need a more extensive surgical procedure that removes the cyst entirely.
At Mayo Clinic, research is going on to get cure for pilonidal cyst.
Around 25% people are affected by pilonidal cyst.