A cyst is a benign mass that grows in the body in the form of a sac in one of the internal organs and is an abnormal collection of body fluids whose contents are liquid in nature. It grows mainly on the surface of the body and in the internal organs. Common epidermal and subcutaneous cysts include: sebaceous cysts (sebaceous glands inside the cyst), rash decaying hair cysts, etc. The cysts in internal organs are: kidney cyst, liver cyst, ureteral cyst, ovarian cyst, etc. There is an essential difference between cysts and tumors. Cyst is a benign disease and is usually not cancerous. On the other hand, tumor is a new organism formed by the loss of normal regulation of its growth by a cell of local tissues at the genetic level under the action of various carcinogenic factors, resulting in its clonal abnormal proliferation, and there are benign and malignant tumors. Some tumors (benign or malignant) can also form a tumor cystic cavity due to the metabolic death of the tumor at the center of the tumor, but this cavity cannot be called a cyst. Many cysts are congenitally inherited, for example, hair root sheath cysts and multiple lipodystrophies are chromosomally inherited, and dermatomal cysts are born with them. Some cysts are even unrecognized throughout life and live “peacefully” with their owners for the rest of their lives. A liver cyst, for example, is a small blister in the liver that is congenital and is usually ignored. Unless the cyst is large or numerous, then it should be removed surgically.