A Reactive Allergy Might Be The Cause Of Your Sudden Hives bejo 6909 Share A Reactive Allergy Might Be The Cause Of Your Sudden Hives Sudden Hives : r/DermatologyQuestions Sudden hives, blood test shows no allergy : r/urticaria Read also: Health Influencers Are Raving About Benefits Of Peppermint And Green Tea