Skin problems or excessive friction can cause the hair between buttocks to be pushed inwards. This can lead to a pilonidal cyst formation Foul smelling pus may be observed draining from the pilonidal ...

Medically reviewed by William Truswell, MD An ingrown hair cyst looks like a small red bump and often causes no pain.You can ...

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.

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 ...