Girls, what should I put on these scars after chickenpox? To prevent t…

Girls, what should I put on these scars after chickenpox? To prevent them from becoming permanent scars in the future? If there were only 2-3 on his face, it would still be okay. He has all of his face scarred. Even though he's a boy, I don't want so many scars left... I'm even angry at my sister and her child, if not for him, my child wouldn't have gotten chickenpox. But on the other hand, they didn't know that everything would turn out this bad... ???