Hair grows out of pores, small openings in the skin that secrete sweat and sebum (oil). An ingrown hair cyst occurs when dirt or oil blocks off a pore, causing a hair to become trapped. This leads to ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Ingrown hairs are a pain in the neck—and other sensitive places. And if you’ve ever found one along your ...