Why do epidermoid and pilar cysts form?

Some of the cells in the top layer of skin produce keratin, a protein that gives skin its strength and flexibility. Normally, these cells move upto the surface of the skin as they start to die, so they can be shed.

But sometimes,these cellscan move deeper into your skin and multiply, forming a sac. They secrete keratin into the middle of the sac, whichforms athick, yellow paste. This can ooze out of the cyst if it is burst.

Anyone can develop a skin cyst, but you're more likely to have one if you've gone through puberty, you have a history of acne , or youhave injured the skin (if you've damaged a hair follicle, for example).

Skin cysts are not contagious.

Content supplied by the NHS Website

Medically Reviewed by a doctor on 21 Dec 2018