If the scar is large, you may have to excise it first and then close it. If it is long you may need to close it in an irregular way to break up the line so that the brain doesn't notice it.
Your brain is more likely to notice a line that is over 7mm in length. Anything longer than that will need to be made irregular for the brain to not notice it as easily. Once the scar is thinner you can then use lasers to resurface the area to make it look better.
CO2 lasers are the best for this and there are a lot of names for these lasers depending on the company. Lumenis, with its Active FX is the best CO2 laser out there in my opinion, and it also has Deep FX, which is fractional and can tighten the skin.
Some very large scars need more complicated treatment approaches to make them look better. Dermabrasion can also help the appearance of the scar.
All of these techniques depend on the person doing it, so you want to go to someone with a lot of experience with these techniques and someone with a diverse approach to treating scars.
