Hi..., lipoma is a knot of fatty tissue that is usually found just below the skin...Lipomas can occur almost anywhere on the body, but are most commonly found on the trunk, shoulders, neck, and armpits....In many cases, lipomas do not need to be treated. Instead, your doctor may simply recommend watching the lipoma on a regular basis..... Occasionally, a lipoma causes pain or affects muscle development and needs to be removed.....