Mouth ulcers, belonging to the Chinese medicine “mouth sores” category, according to the identification of the oral administration of cool diaphragm powder plus reduction, Zhi Bai Di Huang Tang plus reduction, with the addition of Lizhong Tang plus reduction, and so on. Specific need to identify the treatment. 1. Heat accumulation in the heart and spleen: ulceration of the oral muscular membrane, peripheral redness and swelling, burning pain, especially when eating or talking, thirst, insomnia, constipation, short yellow urine. Red tongue, yellow or greasy moss, and number of pulse. Add and subtract cool diaphragm powder. 2. Yin deficiency and fire exuberance (deficiency of yin essence in the body, hyperactive fire): mouth ulcers are few in number, the surrounding redness and swelling is not very serious, the pain is mild, but the healing is more and more, prolonged. Heat in the hands and feet, insomnia, dry mouth and tongue without desire to drink. The tongue is red with little moss, and the pulse is fine (the pulse becomes narrower, thinner and faster). Zhi Bai Di Huang Tang can be used. 3. Spleen and kidney yang deficiency: Mouth sores are mildly painful, white or dark in color, with reddish or non-reddish periphery, and difficult to heal for a long time. Tiredness (fatigue), pallor, cold pain in the waist and knees or below the abdomen, long and clear urine, dullness (no appetite, reduced food intake), loose stools (thin and unshaped feces), pale tongue, white moss, and slow pulse. You can take Radix Polygoni Multiflori Tang plus subtractions. Do not use medicine without authorization, need to use medicine under the guidance of a doctor.