Lumps under the skin can be a huge shock for those affected. If they are lipomas, there’s no need to worry: These slow-growing, benign tumors originate from fat cells and are harmless in most cases.

A lipoma is a soft cancerous lump made of fatty tissue that grows just beneath the skin. It is usually painless, slow-growing, and often harmless. Lipomas are quite common, typically appearing on arms ...