Fraxel laser for Lip Lift scar? (photos)

My liplift scar is a little bit too visible, colour is ok, but there is an indentation and uneveness along the whole scar that makes it visible in some lightnings. The surgery was done almost two years ago. I have tried a bit of fillers, Belotero, but it seems to just last a month or two, then I need to refill it again. What type of laser could make the appearance better? Is fraxel laser a good option? Is there any risks about it, can it make the scar worse?