Pilonidal sinus—also called a pilonidal cyst—is a skin infection that occurs in or around the crease of your buttocks. This condition happens when hair, skin cells, and dirt clog a hair follicle, ...

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 ...

There are different types of pilonidal cyst surgery. One involves cutting the cyst to drain the fluid, while another involves removing the cyst completely. Depending on the surgery type, a person can ...

Q: I have a cyst on the end of my tailbone that's been there for years without any problems. My friend says that she has a similar problem, but under her arm. Her doctor told her that she has ...

A pilar cyst, sometimes called a trichilemmal cyst, forms when a hair follicle gets clogged. They can happen anywhere on your body but are most common on the scalp. Pilar cysts can be irritating but ...