An 84 burn on the anus should be treated with a cold water rinse along with medication. 84 usually refers to 84 disinfectant solution, which is a mixture of sodium hypochlorite and sodium chloride. Direct action on the skin and mucous membranes can lead to chemical burns. The treatment methods are as follows: 1. Cold water rinsing: After the anus is burned by 84, patients should use a lot of cold water to rinse the anus to reduce the contact between the anus skin and 84, to stop further damage, and at the same time be able to relieve pain. 2. medication: in addition to cold water rinse, patients also need to follow the doctor’s instructions for the use of drugs for local application, such as erythromycin ointment, gentamycin ointment, can be anti-inflammatory, antiseptic, to prevent local infection phenomenon, if necessary, can be taken orally amoxicillin, cephalosporin and other antibiotics. 3. Wound protection: the use of sterile gauze and other protection of the damaged area. After the anus was burned by 84, should be timely medical treatment, the above drugs need to be used under the guidance of a doctor, can not be used indiscriminately, so as not to lead to adverse consequences.