Getting rid of a scar?

A scar results from healing in which the collagen fibers and deep tissues align in a certain way based on the skin stresses and forces. After years of your forehead uming certain positions, the collagen bundles are now in a certain "permanent configuration. Also, the reason for the "dent" is that with scarring, things contract and the deeper tissues have done so, pulling the scar inwards. Your options include having the scar surgically revised by a plastic surgeon or other skilled skin surgeon, having a dermatologist or plastic surgeon fill it in with skin fillers to "raise" it or not worrying about it if no one else seems to care. Mederma seems to help better when the scarring is fairly recent, not after years and years.