Had a lipoma removed from my forehead. Started hot and cold treatment to reduce swelling. How well does this help?

Had a lipoma remover surgery on my forehead. After few days of swelling on my face as the blood seems to be go down south, my face is back to normal. But the site of the surgery where the lipoma was removed from is hard and swollen. my doctor said i should give it two weeks to resolve on it own. But a clotted hematoma on my forehead is disturbing. I've started hot and cold treatment as i read online to reduce swelling and heal faster. How well does it help.