The correct method of applying Cornus officinalis to the heart of the foot is as follows: grind Cornus officinalis and mix it with oil or water, apply it to the Yongquan acupoint, and fix it with adhesive tape or band-aid. Cornus officinalis has the function of dispersing cold and relieving pain, lowering the rebelliousness and stopping vomiting (stopping the upward rush of stomach qi, stopping vomiting), and assisting yang and stopping diarrhea, and is mainly used in the treatment of headache, abdominal pain, nausea, and vomiting caused by cold, as well as the treatment of diarrhea caused by yang deficiency of the spleen and kidney. Wu Zhu Zhu can be used externally to draw fire downward. Applying Wu Zhu to the center of the feet can improve symptoms such as mouth ulcers caused by deficiency yang upward (relative deficiency of yang affecting the head and face) or deficiency cold syndrome. Note that Cornus officinalis is pungent and hot, and should not be used externally in patients with solid heat syndrome. Cornus officinalis is pungent, hot, dry and strong, and tends to deplete qi and wind, so it should not be used more often. Adverse effects are not known. If you need to use Cornus officinalis, please under the guidance of a professional physician to identify the evidence, do not self-medication, so as not to affect the health of the body.