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The burn may be deep so effective skin product may nor exist and only option may be to do full thickness skin grafting
on that area to bring back colour. You can wait upto 3 months from the injury
and if there is no proper healing and scar formation you will need to consult Plastic Surgeon/Dermatologist
in this regard. Please avoid applying such things on your face no matter what anyone says. Before knowing side effects of something, do not use it. Eat healthy. Drink plenty of water. Avoid sun exposure.