A pilonidal cyst, sometimes called pilonidal disease, is a fluid-filled sac that usually occurs on the tailbone at the top of ...

Riding in jeeps, touring in tanks and taking the bumps of basic training have caused such an increase in pilonidal-cyst disorders that some doctors call them jeep disease. Cause: an infection of a ...

Usually, cysts do not hurt unless they are large or an infection develops. An infected cyst may make the skin red or discolored, itchy, and tender. Skin cysts often contain keratin, a protein that ...