Suggest Remedy For Dark Skin Patches?

A seizure disorder I start having them when I was 13 years old last year I fell on a base board heater at home an woke up in the icy wit 3rd degree burns on my face didn't get the skin graph because they wanted to get the skin from my scalp an I was already in enough pain I just couldn't go through with it now its been a year an I have these dark patches on my face what can I use to even out my complexion