Hydrogen peroxide at a concentration of 3% can be used to clean the ears for otitis media, but it should be used according to the condition as prescribed by the doctor. Hydrogen peroxide is a solution commonly used in clinical practice and is generally used to disinfect skin and mucous membranes. Pouring 3% hydrogen peroxide into the ear can effectively kill bacteria in the ear, break down pus, and help discharge secretions from the ear, and is suitable for middle ear infections that result in a large amount of pus in the external ear canal. If there is no inflammation in the ear canal, the hydrogen peroxide poured into the ear will irritate the external ear canal and lead to congestion and inflammation of the mucous membrane of the external ear canal. Wounds are disinfected with hydrogen peroxide and cannot be directly disinfected with highly concentrated hydrogen peroxide. Not only does highly concentrated hydrogen peroxide fail to disinfect, it also burns the skin and tissue of the wound. The use of hydrogen peroxide needs to be used under the guidance of a doctor to avoid the adverse consequences of private use of hydrogen peroxide.