My 7 year old son developed hives yesterday. They started on his torso and arms. Lessened after benadryl. Reappeared from groin down then from head to toe including face, mouth, and ears. They were extremely itchy and he was begging for help. Now he has. Developed a wet cough. What is your advice? Thank you. My name is Raquel. My son had a frozen confection (made mostly of sugar and various gums) and jumped and rolled around on an outdoor trampoline just before the hives appeared. He is allergic to sulfa drugs and lactose intolerant. He weighs 47 lbs.