How To Fade my pimple scar?

Im not very old, only a little into my teen years, and i have a big pimple scar right in the middle of my forehead. I have been covering it with my hair but it doesn%26#039;t look good like that. I have mederma for a different scar i have and have put it on there every night for a while, it hasn%26#039;t helped much. Please Help!!|||shut up.