A cyst can develop due to a clogged oil gland or hair follicle. Cysts feel like soft blisters when they are close to the skin’s surface, but they can feel like hard lumps when they develop ...

The cyst should not adhere to the skin, and the skin should have a normal color. One test to diagnose a ganglion cyst is to hold a light source, such as a small flashlight, against the cyst.

Similar to nodules, cysts are caused by clogged pores beneath the surface of the skin. They contain fluid or pus, and they may appear large, red, and are typically painful. Like nodules ...