Has anyone’s little ones had hives?

My son came out with rashes yesterday afternoon. Rang doctors they said it was hives from the pictures and gave me piriton in baby form to give him. They disappeared after a few hours.

He got them back today even worse! They don’t bother him, he doesn’t itch, when I touch them he doesn’t moan and they don’t feel hot too touch!

Has anyone else’s baby had hives? Does this look like hives? I don’t even know why you get hives!

LAST PICTURE HIS LITTLE BUM LOOKS BRUISED BUT IT ISNT!