My son is 4 year old. His face has burnt 3-4 hours before. It looks like this pic attached below. How long does it take to heal and disappear the scars? Is it too deep?

A. First you have to see how deep the burnt is you have to check with your doctor and accordingly they will advise you with the right ointment that you can use and treatment to follow it can take about a month or more than that depending upon how deep the car and heard that your child has had