Looks like it to me. Did you switch soap or laundry stuff? Or not even switching maybe. I used tide with febreeze (umm spell?) For years and one day developed an allergy to it.

Yes, looks like hives.

Looks like it to me. Have you changed anything recently, like soaps or laundry stuff? Or has he ate anything he never had before?

What other symptoms does he have? I’d go to an emergency room. That doesn’t look ok