If your child has raised spots that merge into patches to form an itchy rash, it might be hives or urticaria. It’s a good idea to take your child to the GP.
Rashes in kids—when to worry - Hamilton Health Sciences
Papular urticaria
Urticaria (hives)
Q & A: What parents need to know about hives in kids
Hives - NHS
What Causes Hives in Kids Out of Nowhere? - 127 Pediatrics
Hives In Kids: Reasons, Symptoms & Treatment
Hives or urticaria in children & teenagers
What Are Hives In Children: Causes, Symptoms, And Treatment
How Deal with Papular Urticaria in Kids