this will depend on the type of scars sustained after the burn as mentioned by Dr Shane and Dr Winston.
Hyperpigmented (dark) scars can be lightened with Q-Switch lasers. Raised scars can be reduced with steroid injection. To further blend in and reduce the appearance of the scar, ablative lasers can be used. Other types of scars may need surgical revision.
It's best to let your doctor have a look at the scars so that he/she can formulate a treatment plan that suits your condition.
Hope that helps!