Myomas are benign tumors that grow from muscle. Leiomyomas grow from smooth muscle, which is found in internal organs such as the stomach and uterus. They can start in the walls of blood vessels. In the wall of the uterus, leiomyomas are often called fibroids. A rare benign tumor of skeletal muscle is rhabdomyoma. These tumors may be simply watched. To address symptoms, they may be shrunk with medication or removed with surgery.

Nevi (commonly known as moles) are growths on the skin. They can range in color from pink and tan to brown or black. You may develop new moles until about age 40. Moles that look different than ordinary moles (dysplastic nevi) may be more likely to develop into a type of skin cancer (melanoma). For this reason, it is important to have your skin checked regularly by a health care professional.