Hello
It is important to know more details like how many patches , how big is the patch , how many previous episodes, also needs to be differentiated from Tinea capitis (which is a fungal infection common in 5 year old ) . If the child has already been diagnosed asalopecia areata then you can use eumosone cream over the patch , twice daily for 15 - 20 days .
Next Steps
I strongly suggest you to take a video consultation to be sure of the diagnosis and to be able to prescribe an appropriate treatment