Hi! 6 yr old son is recovering from gastroenteritis, just started eating again yesterday after five days without food. He s eaten banana, ham, grapes and peanut butter (all usuals from before he got sick). This evening he s come out in hives on face, back, legs, arms but not stomach. Mildly itchy. Not feeling nauseous again. Possible contact reaction to lying on a leather sofa which he vomited on yesterday and was cleaned with hot water? Any other ideas? Thank you!