How to Smooth Out / Get Rid of Bump On Forehead?

When i was 15 i got hit in the head pretty hard. I was in a tight situation & i didn't get to ice it down or anything till the next day. this bump on my forehead has stayed for almost 3 years now. it feels pretty hard, & it is some what moveable. this has been lower my self confidence,and is ruining my high school life and i want to make a change on my last year. I know boxers get hit all the time and they're able to get rid of it, whats the secret. Any answer would help except surgery, thank u