This can't absolutely think what kind of fire oral ulcer belongs to. Internal fire (including real fire and virtual fire) may cause sores in the mouth and tongue. Of course, according to the five elements theory of Chinese medicine, the mouth and spleen and stomach belong to the soil, so the sores on the mouth, lips and tongue will first consider the spleen and stomach, but we must never absolutely say that the heart fire is excessive, the blood is deficient, and the spleen and kidney are yang-deficient (spleen and kidney yang-deficiency can make the heart and kidney lose sight)
Generally speaking, oral ulcer is considered by Chinese medicine to be an imbalance of yin and yang in the body, which leads to a fiery upward attack of yang in the body. To reconcile yin and yang in treatment is to attack them unprepared. Prescriptions can only be prescribed according to the actual situation.