You can’t apply iodine or alcohol directly to treat vaginitis, you can use iodophor to apply it. Iodine is made of iodine and alcohol, iodine and alcohol are both strong corrosive disinfectants, which can only act on the surface of the skin, if you use iodine or alcohol to wipe the vagina, it will lead to damage and necrosis of the vaginal mucous membrane, resulting in serious consequences, so it can not be used directly. If you want to sterilize the vaginal area, you can use iodophor, which is very irritating. However, simply rubbing with povidone iodine is relatively ineffective and needs to be supplemented with medication or other means of treating vaginitis. If you suffer from vaginitis, you need to be guided by a doctor to standardize the treatment, not blindly self-medication, so as not to cause serious adverse consequences.