One of the signs of a sarcoma is a lump ... skin that may or may not be painful. So if you feel one of these lumps, what should you do? "Many patients will wonder: 'I have a lump on my arm or my leg.

"These pink-brown, hard bumps in the skin are technically a type of scar ... They can appear anywhere on the body, but most often show up on the legs and arms. What causes dermatofibromas ...