Cang Er Zi is poisonous, and the benefits of Cang Er Zi foot soak are that it can relieve itchy rubella on the feet, promote the flow of qi and blood in the feet, etc.. Cang Er Zi, has the efficacy of dispersing wind-cold, opening the nose, dispelling wind-dampness and relieving pain. It is used for the treatment of wind-cold headache, nasal congestion, nasal congestion, nasal abyss (mainly manifested as filthy nasal mucus, the amount of which can not be wiped clean), rubella itching and so on. Cangzhi foot soak has the effect of relieving rubella itching of the feet, promoting the circulation of blood and Qi in the feet, and relieving fatigue. Note that blood deficiency headache should not take Cang Er Zi. Overdose of Cang Er Zi can easily lead to poisoning. If there is any discomfort after soaking feet with Cang Er Zi, it is recommended to stop using it and consult a doctor in time.