I have acne scar but they are not deep they are on the surface is there an cream that can help lighten it? Like Mederma

Not a fan of Mederma. I am not a big advocate of mederma. The active ingredient is allium cepa (onion extract) and there is weak evidence to suggest that this is beneficial but the research behind medierma is some what not convincing. While it will not hurt unless you have a topical allergic reaction, it probably will not help. You are better off to try silastic sheeting or silicone gel + sunblock.