Since last fall, certain things trigger my throat to swell. No runny nose, itchy eyes, hives, difficulty breathing though. Car exhaust, garages, musty leaves or crawl spaces, cleaning agents, bleach, fabric softener, perfumes, sometimes a dog that has a skin treatment. Doctor recommended an antihistamine. I took one, one day last week, then a few hours later went to an enclosed swimming pool. Within 5-10 minutes, my throat swelled and my throat was covered in little white bumps. Doctor is on vacation. We talked about an allergist. I was checking out allergic reactions on this site and nothing seemed to fit my symptoms.