Home remedy.

          Last year when I was in my home country , the youngest son of my aunt was fall strongly on his forehead. It made his forehead very swollen and it became red and dark color. My aunt took pieces of potato and put it on his forehead suddenly because he didn't  want it. Maybe he felt some pain ,I don't know but I thought it is not painful to put potato on something swollen in your body. Finally his forehead became better and next tow days the swelling disappeared.