To lessen scars, try using coconut oil. It seems to stimulate skin renewal. It has significantly reduced the brown sundamage discoloration on my cheeks. I put it on after the shower, on damp skin.
I had a raised white scar on one knee for almost 40 years that has receded almost completely after using coconut oil on it for a few months. Same with a brown scar on my arm from a serious burn I got 20 years ago.