Kid chewed a pretzel that a friend gave him with peanut butter inside. After chewing, realized it and spit it out, but reaction was starting. Vitals were all normal and lungs clear. Gave Benadryl while calling parents. Started with hives around mouth. Gave Epi pen and called 911. Mom and ambulance rolled up at same time and kiddo transported. Kid learned not to eat anything from someone else.