Hydrogen peroxide, also known as hydrogen peroxide, belongs to the disinfection and antiseptic drugs, can be in direct contact with the hand. Hydrogen peroxide is an oxidizing agent, encountering oxides will rapidly decompose and produce foam, normal concentration of 3% hydrogen peroxide, can be in direct contact with the hand, generally does not cause other effects; if too high a concentration or zinc oxide, there may be burns and pain. Suitable for purulent otitis externa, otitis media, Vincent’s stomatitis, wisdom tooth leakage, tonsillitis and cleaning wounds. Adverse reactions: high concentration will produce irritation of the skin mucosa, the formation of burning pain white scabs; continuous gargling will produce hypertrophy of the tongue papilla, which is reversible; enema prone to air embolism or intestinal gangrene. It is recommended to use under medical supervision to avoid abusing the drug by yourself.