A cyst is basically a closed pocket that contains either fluid, air, cells, or parasites. Subcutaneous cysts located under the skin are often operated on when they are visibly intrusive and not cosmetically sound.
Cyst, nevus, keratosis excision is a surgery that involves removing the cavity and its contents. These procedures are done under local anesthesia and leave a scar that will become less noticeable over time. This procedure is also called excision of a benign lesion of the skin.