The Side Effects
While it is normal to experience stinging, redness, and irritation after applying hydrogen peroxide to an affected area, if these continue to persist get worse, contact a medical professional immediately. Most people who use hydrogen peroxide won’t experience any side effects, and severe allergies to hydrogen peroxide are quite uncommon.
Allergic Reactions
While it is very rare to experience a severe allergy to hydrogen peroxide, it can’t be completely ruled out. If you experience swelling of the tongue, throat, and face, as well as itching, immediately contact a doctor or other health care professional.