Cysts can develop almost anywhere on the body, from just beneath the skin to internal organs. Ovarian Cyst - StatPearls - NCBI Bookshelf

Understanding Cysts: Types, Causes, and Care A cyst is a closed, sac-like pocket of tissue that can contain fluid, air, sebum, or other materials. While finding a new lump can be alarming, the vast majority of cysts are benign (noncancerous) and often do not require medical intervention unless they become painful, infected, or cosmetically bothersome. Common Types of Cysts