The skin cells form the walls of the cyst and they secrete the protein keratin, a yellow substance, into the center. Your skin may be prompted to do this by a damaged hair follicle or oil gland[1].

A woman has been left permanently scarred after she mistook a giant cyst on her face for a spot. Steph Warkotsch, 30, developed a 2.5cm cyst on her face and needed 30 stitches after it was removed.

A cyst is a saclike pocket of tissue containing air, pus, fluid, or other materials. They are usually benign (noncancerous) ...