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On holidays and 3 yo covered in what looks like nettle stings.
Viral rash given they are unwell and temperature too, I would guess. Would not expect a temp with allergic reaction in my experience of children with allergies. My eldest (no allergies) has had a viral rash before. It looked like he had been rolling in nettles, all over his trunk.
OP, my son got something very similar when we were in Portugal last year. He played a lot of football on the grass in our resort and he seemed to react to whatever they were spraying on the grass. It looked exactly like a nettle rash. He coincidentally had a high fever too but went On to get tonsillitis so both were probably not related. Hope you get sorted.
We are in Portugal just now and my 16 month old has a very similar rash. She had two days of high temps and it turned out she had tonsillitis so is now on antibiotics. I'd get him seen by a medical professional just in case.