Three year old keeps coming out in hives. Every few days or so it'll be on his face, arms and torso. First time he was eating nuts so he's been for a blood test, but then it happened again and again with no apparent cause. He's seemed fine in himself other than very runny poo when he gets the rash. Has anyone else experienced anything like this? Doctor reluctant to say anything until bloods are back, but these will take up to 2 weeks. In anxious mum mode!