What Is the White Stringy Stuff That Comes out of a Cyst?

These cells form the wall of the cyst and secrete a soft, yellowish substance called keratin, which fills the cyst.

What is the white stuff coming out of a cyst?

Normally, these cells move up to the surface of the skin as they start to die so they can be shed. But the cells sometimes move deeper into the skin and multiply, forming a sac. They secrete keratin into the middle of the sac, which forms a thick, yellow paste. This can ooze out of the cyst if it's burst.

What does the stuff that comes out of a cyst look like?

It's usually caused by a buildup of keratin under the skin. It looks like a skin-colored, tan, or yellowish bump filled with thick material. It may become swollen, red, or painful if it's inflamed or infected.