A lipoma is a noncancerous (benign) tumor made up of fat tissue. It appears as a soft raised area, just under the skin. It's usually less than 2 inches across. Lipomas are usually round, movable lumps under the skin. They usually grow in the neck, shoulders, back, or arms. But they can be found anywhere in the body where normal fat cells are present.
Lipomas often don't need to be treated, but may be removed for cosmetic reasons. If lipomas put pressure on nearby tissues and become uncomfortable, they may be removed. They may also be biopsied or removed if you or your doctor is unsure of the diagnosis. A biopsy will make sure the growth isn't something more concerning.