VITAMIN E..... I had a scar on my finger from my curling iron and I used Palmer's Coco Butter Scar Treatment... I applied it three times a day for about a month now you can't even see it... it is great for stretch marks too....I used the same stuff for my baby bump.
scars are PERMANENT. they will never go away, however yo can sometimes fade them and make them a bit less noticable by using things like palmers cocoa butter or bio oil on them
To my knowledge there's not much you can do. You can try putting on lotion and whatnot but I don't think there's anything that will make it go away completely.
Bio Oil is amazing. I use it for all of my scars and it works a treat :) its not even that expensive :) x