A gruesome simulation has explained why a pilonidal cyst can be the 'most painful condition' in the buttocks region.

A pilonidal sinus is a small hole or tunnel in the skin that can easily become infected. It typically forms in the cleft at the top of the buttocks. When a pilonidal sinus becomes infected it can turn ...

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 ...

Also known as a pilonidal cyst, the condition forms when a sac of tissue fills with air or fluid in the crease of your buttocks. Pilonidal cyst, doctors say, is mostly caused by a skin infection.

Dear Dr. Roach • The article about the boy suffering after surgery for three years from a pilonidal cyst really hit home. My son developed a pilonidal cyst in June 2012 and also had a very bad ...

I am 22 years old and have had trouble with a cyst on my tailbone for years. Once or twice a year the cyst begins to hurt, and then opens up and drains spontaneously. Should I see my doctor about this ...