allergy - n. a medical condition that causes someone to become sick after eating, touching, or breathing something that is harmless to most people

reversal - n. a change to an opposite state, condition, decision, etc.

pediatrician - n. a doctor who treats babies and children

swell - v. to become larger than normal

epinephrine - n. a kind of medication that is used in emergencies to treat serious allergic reactions to insects, foods, drugs or other substances.

introduce - v. to make (someone) known to someone else by name

assume - v. to think that something is true or probably true without knowing that it is true