Looks like fungal infection
Ur soliderm cream contains anti fungal so continue with that
But also apply zinc onitment like protectoderm which will help in healing 2 times /day
Keep area dry
It will take time to heal around 4weeks
But if this is increasing do consult your pediatrician
Next Steps
Oral zinc Syp will help in help in healing
Syp zinconia 5/20mg ,2.5 ml for 14 days
Health Tips
Keep area dry