A lipoma is a round or oval-shaped lump of tissue that grows just beneath the skin. It’s made of fat, moves easily when you touch it and doesn’t usually cause pain. Lipomas can appear anywhere on the body, but they’re most common on the back, trunk (torso), arms, shoulders and neck. Lipomas are benign soft tissue tumors. They grow slowly and are not cancerous. Most lipomas don’t need treatment. If a lipoma is bothering you, your healthcare provider can remove it with an outpatient procedure.