Laser scar revision is generally done under local anesthesia, but extreme cases can call for general anesthesia. Your doctor will have already chosen one laser from among several used for scar revision (CO2, Er: YAG, fractionated and pulsed dye among them). He or she will move the laser along your scar, removing a layer of skin and exposing a new layer which will, as it heals, minimize the scars appearance.