Xiao Feng San, also known as Wind-Dispersing Powder, comes from the book "Surgery Authentic" written by Chen Shigong, a medical scientist in the Ming Dynasty. This book is a classic work of Chinese medicine surgery, which records in detail the diagnosis and treatment methods of many surgical diseases, and Xiaofengsan is one of them. Xiao Feng San is mainly used to treat skin diseases such as measles and eczema, and has the effects of dispelling wind and dampness, clearing heat and nourishing blood.

Explanation of Xiao Feng San prescription
The ingredients of Xiao Feng San include Angelica dahurica, Radix Rehmanniae, Saposhnikovia divaricata, Cnidium monnieri, Anemarrhena asphodeloides, Sophora flavescens, Sesame, Nephrolepis chinensis, Atractylodes macrocephala, Fructus arctii, Gypsum, Licorice and Akebia.
The main medicine : Nephrite, Saposhnikovia, Burdock, Cicada. These four herbs are mainly used to dispel wind and expel evil, clear the skin and muscle surface, and remove the wind evil on the surface, which has the effect of dispelling wind and relieving itching.
Assistant medicines : Sophora flavescens, Atractylodes macrocephala, Akebia. Sophora flavescens clears heat and dries dampness, Atractylodes macrocephala is bitter and warm and dries dampness, Akebia promotes urination and clears dampness and heat, and is mainly used to clear heat and remove dampness.
Adjuvant : Gypsum, Rhizoma Anemarrhenae. These two herbs are used together to clear away Yangming heat evil and have the effect of clearing away heat and purging fire.
Assistant drugs : Angelica, Radix Rehmanniae, Sesame seeds. Angelica and Radix Rehmanniae nourish yin and moisten dryness, nourish blood and activate blood circulation; Sesame seeds nourish the liver and kidneys, nourish blood and moisten dryness. These drugs are mainly used to nourish blood and activate blood circulation, and prevent wind, dampness and heat evil from invading the skin and damaging yin and blood.

Effects and pathogenesis of Xiao Feng San
Xiao Feng San is mainly used to treat skin diseases such as rubella and eczema. Its main symptoms include itchy skin, red rashes, or cloud-like spots all over the body, oozing fluid after scratching, white or yellow tongue coating, and rapid pulse .
Most of these symptoms are caused by the accumulation of wind evil, dampness and heat on the surface of the skin . When these bad things invade the human body, they affect the flow of blood, making it difficult for them to be discharged smoothly. As a result, these evil qi will accumulate on the surface of the skin, causing itching of the skin, red rashes, or the leakage of tissue fluid after scratching.

effect
The main effect of Xiao Feng San is to dispel wind and dampness, clear away heat and nourish blood . It can stop itching and eliminate rashes by dispelling wind and expelling evil, clearing away heat and dampness, nourishing blood and activating blood circulation. Therefore, this prescription is a commonly used prescription for the clinical treatment of acute skin diseases, especially for the treatment of rubella and eczema.
Dispel wind : Use the four herbs of Nephrolepis, Saposhnikovia divaricata, Arctium lappa and Cicada ovata together to dispel wind and expel evil, unblock the skin and muscle surface, and remove the wind evil scattered on the surface, which has the effect of dispelling wind and relieving itching.
Heat-clearing : Sophora flavescens clears heat and dries dampness, Atractylodes macrocephala is bitter and warm and dries dampness, Akebia trifoliata promotes urination and clears dampness and heat. Gypsum and Anemarrhena asphodeloides can clear away Yangming heat evil, with the purpose of clearing heat and purging fire.
Dehumidification : Herbs such as Atractylodes macrocephala and Akebia trifoliata have the effects of clearing away heat, drying dampness and promoting urination, and can effectively remove dampness from the body.
Blood nourishment : Angelica sinensis, Radix Rehmanniae, and Sesame Seed nourish yin and moisten dryness, nourish blood and activate blood circulation. Generally, Chinese medicine for treating skin diseases will be combined with blood nourishment, because wind, dampness, and heat evil invade the skin and easily damage yin and blood. The wind-removing and dehumidifying drugs in the prescription are dry, which can also easily damage yin and blood. Therefore, ancient doctors believed that "to treat wind, you must first treat blood, and blood will circulate and wind will naturally disappear."

Pathogenesis
Xiao Feng San treats rubella and eczema, which are caused by wind-heat or wind-dampness invading the human body, soaking into the blood vessels, preventing the internal organs from being discharged, and preventing the external organs from being penetrated, and stagnating between the skin and pores. After wind-dampness and heat invading the human body, it will cause obstruction of the circulation of meridians, qi and blood, and the appearance of rashes on the skin, especially itching.
The ancients said that "itching comes from wind" and "the nature of wind is to move and change frequently" , which means that wind evil can easily cause skin itching, and the location and degree of itching will constantly change.
When the skin is itchy and scratched, the tissue fluid oozes out, which is a sign of heavy dampness in the body. When the skin has rashes, it is a sign of heat in the body. When it is wind evil, the tongue coating is white, and when heat evil is strong, the tongue coating is yellow. A floating and rapid pulse indicates wind and heat.
Xiao Feng San is used to treat skin infections that result in rubella and eczema. The treatment should aim to "dispel wind, remove dampness, and clear away heat," while also nourishing the blood.

Modern application and pharmacological research of Xiao Feng San
In modern medicine, Xiao Feng San is often used to treat acute urticaria, eczema, allergic dermatitis, rice field dermatitis, drug-induced dermatitis, neurodermatitis, etc., which are caused by wind-heat or wind-dampness. These diseases are often manifested by symptoms such as itching, rashes, and exudation of tissue fluid after scratching, which are similar to the rubella and eczema described in traditional Chinese medicine.
Modern pharmacological studies have shown that Xiao Feng San has an immunosuppressive effect.
The study found that the decoction of Xiao Feng San can significantly reduce the clearance rate of carbon particles by mononuclear macrophages, significantly inhibit the phagocytic ability of peritoneal macrophages, and also has a significant inhibitory effect on the production of anti-chicken erythrocyte antibody hemolysin and delayed hypersensitivity reaction caused by DNCB, but has no significant effect on the weight of immune organs.
The difference between Xiao Feng San and Dang Gui Yin Zi Yin terms of efficacy and application
Another prescription similar to Xiao Feng San is "Dang Gui Yin Zi", which can also be used to treat skin diseases such as rubella and eczema. Dang Gui Yin Zi is mainly composed of angelica root, raw rehmannia root, white peony root, chuanxiong, saposhnikovia root, nephrite, astragalus root, licorice and other medicines, which has the effects of nourishing blood, activating blood circulation, dispersing wind and relieving itching.
Xiao Feng San: It is mainly used to treat acute skin diseases, such as acute urticaria, eczema, allergic dermatitis, etc. It has the effects of dispelling wind and dampness, clearing heat and nourishing blood.
It combines the four methods of dispelling wind, clearing heat, removing dampness and nourishing blood in one prescription. It is good at treating itching caused by the conflict between wind, dampness and heat in the skin . Symptoms include itchy skin, red rash, and exudation of body fluid after scratching. Xiao Feng San is mostly used in acute skin diseases with both positive and negative effects, which require rapid dispelling of wind, clearing heat, removing dampness and nourishing blood.
Angelica Decoction: It is mainly used to treat chronic skin diseases, such as chronic eczema, chronic measles, psoriasis, etc. It has the effects of replenishing qi and blood, dispersing wind and removing dampness.
It is good at nourishing blood and dispelling wind, and is particularly suitable for skin diseases of blood deficiency and wind dryness , with symptoms including dry skin, itching, scaling, etc. Angelica decoction is mostly used for chronic skin diseases, which require long-term nourishing blood, moistening dryness, dispelling wind and stopping itching.
In summary, the main differences between Xiaofengsan and Dangguiyinzi in terms of efficacy and application are that Xiaofengsan focuses on dispersing wind and dampness, clearing away heat and nourishing blood, and is suitable for acute skin diseases; while Dangguiyinzi focuses on replenishing qi and blood, dispersing wind and dampness, and is suitable for chronic skin diseases.
Notes
When using Xiao Feng San, you need to pay attention to the following points:
It is not suitable for people with rubella due to deficiency and cold.
During the medication period, you should avoid spicy food, fishy food, tobacco, alcohol, strong tea, etc. to avoid affecting the efficacy.
Combining this prescription with warm washing of the affected area or other external medicines will achieve faster results, but avoid using hot water to wash the affected area.
Conclusion
Xiao feng san is a commonly used prescription in traditional Chinese medicine for treating skin diseases such as urticaria and eczema. It has the effects of dispelling wind and dampness, clearing away heat and nourishing blood. Through reasonable compatibility and addition and subtraction, it can effectively treat different conditions. Modern medicine has also confirmed the effectiveness of Xiaofengsan in treating a variety of skin diseases. Therefore, Xiaofengsan has broad application prospects in clinical practice.
I hope this article can help you better understand Xiao Feng San and use it correctly when needed. If you have any questions or need further guidance, it is recommended to consult a professional Chinese medicine practitioner.