I can understand your concerns.
I think I happy that you are applying sunscreen and vit E to protrect the area from further damage.
What I think is your kid is still very young and if you can leave it alone(if there is no infection or inflammation) and it will restore its normal complexion back. But obviously it will take some time and you have to be patient.
If there are still parts of skin that are red and not healed so I would suggest to apply FUSIDERM-H cream on the areas,it's a combination of a mild steroid
and an anti biotic which will reduce the inflammation and infection.
Apart from that keep it clean and try not to apply any topical anti allergics or anti septics.
I hope the information given would be of help.
Thanks and all the best.