Patients with back canker should first be treated with sensitive antibacterial drugs, mostly penicillin or cephalosporins. Thereafter, sensitive antibacterial drugs can be selected based on the results of bacterial culture and drug sensitivity tests to guide clinical use. If the patient has diabetes, insulin can also be applied to control blood sugar, and in severe cases, insulin pumps can be considered. In the early stage, when the canker sores are only red and swollen, in addition to applying sensitive antibiotics, local application of ichthyolite ointment, Ruyi Jinhuang San or magnesium sulfate can be used. If pus spots form or have broken down with high tension, incision and drainage should also be given promptly. In this case, intravenous anesthesia is usually given, a cross-shaped or double-cross-shaped incision is made, the incision line should be beyond the edge of the lesion, the inactivated and purulent tissues in the body are removed, and the pus cavity is filled with saline or petroleum jelly gauze strips, and the medication is changed regularly and intensively, while the growth of granulation tissue is promoted. If the traumatic granulation tissue is fresh, the application of a coating agent or high sugar may also be considered to accelerate the repair.