Thanks for your query.
Relax,there is nothing to worry.
there is formation of fibrous tissue which usually takes time to resolve sometimes 2 to 3 months.
are also formed at injury sites.
If it is not causing any discomfort to your child there is nothing to be done.
In case it increased in size,any associated pain or itching then physical examination will be required for proper management.
Wishing your child good health.