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can you upload a clear jpg image of this hive on his face?
is it itchy? or painful?
no, it is not bullous pemphigoid
I agree with his doctor
many children are exposed to mild viral infections which can cause skin rashes and hives.
you can give him tylenol (acetamenophen) and also Benadryl (diphenhydramine antihistamine 25-50mg) and also used 1% hydrocortisone cream on these hives to help calm them down.
make sure he washes his hands frequently to help decrease chances for viral infections.
that brown mark looks like old blood under the skin causing bruising, possibly from scratching or a broken blood vessel under the area.