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 ...

Different types of pimples can have various appearances, causes, and treatments. Common types of inflamed pimples include papules, pustules, nodules, cysts, blackheads, and whiteheads. You're most ...