A pilonidal sinus is a small tunnel that develops at the top of the crease in the buttocks. Trapped hair around the buttocks crease can lead to an abscess, and a pilonidal sinus may develop as a ...

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, ...

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.

Respiratory infections like the common cold often start with a stuffy nose, and this minor ailment is sometimes followed by pain and tenderness around the cheeks, eyes and forehead — a telltale ...

Having a stuffy nose often comes with pain and tenderness around your cheeks, eyes or forehead. But what do blocked sinuses look like inside your head? When you purchase through links on our site, we ...