Injecting small diluted amounts of cortisone or 5-FU should improve the scar and help to flatten it. Pulsed dye lasers are very effective in the treatment of scars as well, if they have some redness. Both injections and laser treatments used in combination can be very successful in treating hypertrophic scars.
Certainly, if scars become flat and they are still injected, there can be an indentation or slight color change. Therefore, scars should only be injected with cortisone when they are thick and hypertrophic. Your dermatologist will monitor the response of your scars to the injections and decide when they are no longer going to improve from injections. when they become flatter, treatment with PDL could be started to reduce the redness and improve the overall appearance.