Share on PinterestFG Trade/Getty ImagesCysts are noncancerous growths that develop under the skin. They are usually harmless.
Two types of cysts can develop in or near the groin: epidermoid and sebaceous. Although both types look similar, they each cause different symptoms.
Epidermoid cystsAn epidermoid cyst is a movable nodule that sits just below a layer of healthy skin. These cysts contain a white substance composed of the protein keratin, which exists in the skin, hair, and nails.
Sebaceous cystsSebaceous cysts can develop inside a clogged hair follicle or sweat gland. Unlike epidermoid cysts, sebaceous cysts contain a yellow, oil-like substance.