Allergic reaction help!!

One of my family members gave my son peanut butter he is 10 months old , he had hives on just his face by the mouth we gave him Benadryl and they went away now my boyfriend says he should be fine but I’m not sure if we should bring him to the emergency room or not never had allergies so It freaks me out i just worry about his throat closing or something and don’t want to wait until last minute I’ve always heard you bring them in regardless if they have a reaction but maybe I’m overreacting?