In my practice i recommend Embrace Scar Therapy. It will allow your child to play, bathe, swim etc. while helping the scar to heal. It will also help the scar tremendously if you remember to keep it protected with sunscreen even after you are done with Embrace. I hope this helps!
Scar management in a child
It would be wrong to comment specifically on scar management recommendations for a patient who is not under my care. As a matter of generic scar management on post-injury scars on facial injuries on children, if the scar looks good I generally recommend keeping sun off of scars until they have faded to white/skin color. If someone wants to use what I consider a good scar management product that contains sunblock I usually recommend Biocorneum with SPF 30. It's used once a day.