Mouth ulcers should not be poked because the surface of mouth ulcers is mainly necrotic type of tissue mucosa, which usually appears as oval and yellowish. As the ulcer deepens, the color will also deepen. If patients take poking or other measures on their own, it is likely to lead to infection of the mouth ulcer and even further aggravation, and later healing will also leave scarring. Mouth ulcers are self-healing, and will heal on their own in about 7-10 days if the patient does not take treatment. Patients can use a mouthwash containing iodine to promote the healing of mouth ulcers. If they feel pain, they can use a paste with epi-numbing effect on it to reduce the pain. Mouth ulcers are autoimmune deficiency diseases and patients can also undergo TCM to regulate their body along with local treatment.