Weird one, but contractubex scar gel - each country may have different one but if you type it in Google it pops as "silicone scar gel" on Amazon.
It was recommended to me when I had knee injury.
After reading the label I used it for a bit on old acne scars and they did actually begin to fade. At the time I was using exfoliating cleanser, niacinamide gel for new acne, dabs of this gel on scars of old acne and collagen creme... did this only few months but my skin was glowing.
Can't remember why I stopped. Regardless.
That gel is amazing.