A cyst is a closed sac under the skin filled with material. That material may be liquid, soft or hard (calcified and scarred). They can be found anywhere on the body. They are usually slow-growing, painless, freely movable lumps beneath the skin. Occasionally, however, a cyst will become inflamed and tender.
When treatment is desired, cysts are usually easily treated as an in-office procedure with local anesthesia. Treatment options include (1) injection of a steroid medication into the cyst in order to reduce inflammation (2) drainage and (3) complete surgical removal.