Thank you for your query
There are various ointments
available for these kind of marks/scars/wounds. I believe at this stage you should not worry about such hypo-pigmented patches. Your child is too young for this. Give him time. The marks may not go but you will never be late for any treatment. At best some laser treatment
should help him. But at this stage i plead you to not worry about those marks and pursue unnecessary treatment at this age.
God bless you!!