Scarring on face from stitches

When I was younger i had something removed from my face, and it has left a scar. I was told to treat it with rosehip oil, however I was young to think I knew everything and didn’t think I needed it, and was really bad at applying. Now I have a scar left from stitches and I am wondering if there is something I can still use now, even though its 8 years later from when I had the surgery, that will make the discolouration go away. 
Thanks