Cysts (Sebaceous Cysts)

Cysts (Sebaceous Cysts)

Cysts are small closed sacs that contain fluid or solid material. A cyst is an infection and requires draining the contents or complete removal. Sebaceous cysts most often arise from swollen hair follicles. Skin trauma can also induce a cyst to form. A sac of cells is created into which a protein called keratin is secreted. Cysts are usually found on the face, neck, and trunk. They are usually slow-growing, painless, freely movable lumps beneath the skin. Occasionally, however, a cyst will become inflamed and tender.