The fruit of Cang Er Zi is called Cang Er Zi, which is hard in taste and warm in nature, and has the effect of generating sweat, dispersing wind-dampness, clearing nasal passages and relieving pain, and can be used to treat wind-cold headache, runny nose and itchy rash. Therefore, the use of Cang Er Zi, Snake Bed Zi, Di Shen Zi with alum, crushed into coarse powder and boiled with water, soak the eczema affected areas of hands and feet, can make the eczema symptoms gradually reduce, continue to use for a period of time, the itching can gradually disappear, the rash basically subsided. In modern medicine, it is believed that Cang Er Zi has anti-microbial, anti-inflammatory, analgesic, anti-allergic and anti-thrombotic pharmacological effects, and eczema is an inflammatory skin disease with obvious tendency to exude, the onset of which is related to a variety of factors such as abnormal immune function and chronic infection, so Cang Er Zi can be used to treat eczema with certain efficacy. Patients with eczema often have significant itching and are prone to recurrence. In Chinese medicine, it is believed that eczema is actually internal although it is external in form, and the interaction between damp heat and damp heat external evil is the essence of eczema. This originates from internal causes, mainly heart fire, spleen dampness, damp heat into fire is manifested as rashes, erythema, resulting in spleen deficiency, blood dryness, skin hypertrophy and cracking, the disease lingering. Therefore, eczema patients should also pay attention to adjusting their dietary habits, reducing the intake of greasy, spicy and cold food, while maintaining a positive and optimistic attitude, avoiding anxiety, tension and other adverse emotional stimuli.