Near fatal accident in 2003 which left me scarred. Would Microdermabrasion be the best option to fix my residual scarring? (Phot

I want to improve my scarring in 3 areas: 1. Forehead : 3 corrective surgeries undergone. Stitches still show against my skin especially in the sun 2. Top of the nose- this was injected with a steroid and has swollen up. I decided not to go under the knife again. So this remains. 3. Edge between nose and cheek- this has discoloured and the worst of the 3. 4. Edge of the lip - 1 corrective surgery to align better. But the scar remains tough and dark. Suggestions? Microdermabrasion or surgery?