1. Source and History of Formulas

1. Origin of Xiaofeng San

Xiaofeng San (Eliminate Wind Powder) was first recorded in the book 'Orthodox Manual of Surgery' written by Chen Ruoxu in the Song Dynasty. It is a classic formula in traditional Chinese medicine for treating skin diseases caused by wind pathogens in the surgical field. Through long-term clinical practice, Chen Ziming observed that wind pathogens invading the human skin can cause various skin diseases, such as itching and rashes. Thus, he summarized the experiences of predecessors and combined his own clinical insights to create this formula. Initially, it was mainly used to treat surgical ulcers and abscesses with symptoms of wind pathogen invasion. As its clinical application continued to expand, its scope of application gradually extended to various skin itching diseases caused by wind pathogens.

2. Historical Inheritance and Development

In later generations, Xiaofeng San was highly regarded and applied by many physicians, and it was continuously developed and improved during the process of inheritance. Physicians in the Ming and Qing dynasties adjusted and supplemented the formula according to their respective clinical experiences. For example, the selection of drugs became more precise, and the dosage was also more carefully controlled. Some physicians also applied Xiaofeng San to treat wind-related diseases in the fields of internal medicine and gynecology. In modern times, with the in-depth research on skin diseases in traditional Chinese medicine, Xiaofeng San remains a commonly used formula for treating various skin diseases, and new progress has been made in aspects such as dosage form reform and pharmacological research.

2. Introduction of Ingredients (King, Minister, Assistant, Guide)

1. King Ingredients - Schizonepeta, Saposhnikovia

Schizonepeta tenuifolia is pungent in flavor and slightly warm in nature, and it belongs to the lung and liver meridians. Its functions include expelling wind and relieving exterior syndrome, promoting eruption and resolving carbuncles, and stopping bleeding. Schizonepeta tenuifolia is light and dispersing, and is good at expelling wind pathogens. It is a commonly used medicine for treating wind diseases, which can dispel the wind pathogens on the surface through the skin. Saposhnikovia divaricata is pungent and sweet in flavor, slightly warm in nature, and belongs to the bladder, liver, and spleen meridians. It can expel wind and relieve exterior syndrome, eliminate dampness and relieve pain, and stop convulsions. Saposhnikovia divaricata is pungent and warm, with both the smell and qi ascending. It mainly expels wind by pungent dispersion. It can dispel wind-cold-damp pathogens on the muscle surface and also calm internal wind to stop convulsions. It is a moistening agent among the wind medicines. When Schizonepeta tenuifolia and Saposhnikovia divaricata are used together, one treats the wind pathogens in the upper jiao, and the other treats the wind pathogens in the middle jiao. They are used in combination to enhance the power of expelling wind and are the monarch drugs to disperse the wind pathogens on the surface.

2. Minister Ingredients - Cicada Slough, Arctium

Cryptotympana pustulata is sweet and cold in flavor, and belongs to the lung and liver meridians. It has the functions of dispersing wind-heat, relieving sore throat and restoring voice, promoting eruption, removing nebula and improving eyesight, and calming wind and stopping convulsions. Cryptotympana pustulata is sweet and cold for clearing heat, light and floating in quality. It is good at dispersing wind-heat in the lung meridian to ventilate the lung and relieve sore throat, restore voice and treat hoarseness. It can also promote eruption and relieve itching. Arctium lappa is pungent, bitter, and cold in flavor, and belongs to the lung and stomach meridians. It can disperse wind-heat, ventilate the lung and resolve phlegm, relieve sore throat and promote eruption, and detoxify and reduce swelling. Arctium lappa is pungent, bitter, and cold, with the nature of ascending and floating as well as clearing and descending in it. It can disperse wind-heat externally and clear heat-toxin internally, having the effects of clearing heat and detoxifying, reducing swelling and relieving sore throat, and can promote urination and defecation to conduct heat-toxin out. The two herbs assist the monarch drugs to enhance the functions of dispersing wind-heat and promoting eruption and relieving itching, and are the ministerial drugs.

3. Assistant Ingredients - Gypsum, Anemarrhena, Atractylodes, Sophora

Gypsum fibrosum is pungent and sweet in flavor, extremely cold in nature, and belongs to the lung and stomach meridians. Raw gypsum clears heat and purges fire, removes vexation and quenches thirst, and can clear the heat of the lung and stomach. Anemarrhena asphodeloides is bitter and sweet in flavor, cold in nature, and belongs to the lung, stomach, and kidney meridians. It clears heat and purges fire, generates fluid and moistens dryness, and can assist gypsum in clearing the excess heat of the lung and stomach. Atractylodes lancea is pungent and bitter in flavor, warm in nature, and belongs to the spleen, stomach, and liver meridians. It dries dampness and strengthens the spleen, expels wind and dispels cold, and can dry dampness and promote the transportation of the spleen, enabling the dampness in the middle jiao to be transported and transformed. Sophora flavescens is bitter in flavor, cold in nature, and belongs to the heart, liver, stomach, large intestine, and bladder meridians.' It clears heat and dries dampness, kills insects, and promotes diuresis, and can clear heat and dry dampness to relieve skin itching. These four herbs together play the role of clearing heat and drying dampness, purging fire and detoxifying, to address the pathogenesis of wind pathogen combined with dampness and transforming into heat, and are the assistant drugs.

4. Guide Ingredients - Angelica, Rehmannia, Sesame Seed

Angelica sinensis is sweet, pungent, and warm in flavor, and belongs to the liver, heart, and spleen meridians. It has the functions of enriching blood and promoting blood circulation, regulating menstruation and relieving pain, and moistening the intestine and promoting defecation. Angelica sinensis can both enrich and activate blood, and moisten dryness and expel wind, enabling the skin to be nourished. Rehmannia glutinosa is sweet and bitter in flavor, cold in nature, and belongs to the heart, liver, and kidney meridians. It clears heat and cools blood, nourishes yin and generates fluid, and can nourish yin and blood to prevent the wind pathogen from overly injuring yin. Sesamum indicum is sweet in flavor, neutral in nature, and belongs to the liver, kidney, and large intestine meridians. It nourishes the liver and kidney, moistens dryness and promotes defecation, and can moisten dryness and nourish blood to make the skin moist. The three herbs nourish blood and yin, moisten dryness and calm wind, and harmonize all the herbs, and are the envoy drugs.

III. Pathogenesis, Effects and Indications

1. Pathogenesis

The diseases treated by Xiaofeng San are mostly caused by wind pathogens invading the human body, combining with damp-heat, and stagnating in the skin and muscle interstices. Wind is characterized by being mobile and changeable, so the onset is sudden, with severe skin itching and rashes occurring without a fixed location. When damp-heat accumulates internally and steams the skin, symptoms such as skin flushing, erosion, and exudation can be seen. Wind pathogen is a yang pathogen, with the nature of opening and dispersing, and is likely to damage yin and blood. Coupled with damp-heat consuming yin fluid, it leads to insufficiency of yin and blood, and the skin loses nourishment, thus aggravating symptoms such as itching.

2. Effects

Xiaofeng San has the effects of dispersing wind, eliminating dampness, clearing heat, and nourishing blood. In the formula, herbs such as Schizonepeta tenuifolia, Saposhnikovia divaricata, Cryptotympana pustulata, and Arctium lappa that are pungent and dispersing to expel wind are used to disperse the wind pathogens on the surface; Gypsum fibrosum, Anemarrhena asphodeloides, Atractylodes lancea, and Sophora flavescens clear heat and dry dampness, purge fire and detoxify to clear the internal damp-heat; Angelica sinensis, Rehmannia glutinosa, and Sesamum indicum nourish blood and yin, moisten dryness and calm wind, enabling the wind pathogen to be dispelled and yin and blood to be sufficient, and the skin to be nourished. When all the herbs are used together, they jointly achieve the effects of dispersing wind, eliminating dampness, clearing heat, and nourishing blood.

3. Indications

Xiaofeng San (Eliminating Wind Powder) is mainly used to treat rubella and eczema. The symptoms include itchy skin, red rash, or patches all over the body like clouds. After scratching, there is exudation of fluid. The tongue coating is white or yellow, and the pulse is floating and rapid. Clinically, it is often used to treat various allergic skin diseases such as allergic dermatitis, urticaria, drug eruption, etc., and has good curative effects on symptoms such as skin itching, erythema, papules, and exudation.

IV. Analysis of Formula Principles

1. Dispel Wind and Relieve Exterior Syndrome

Four herbs, Schizonepeta tenuifolia, Saposhnikovia divaricata, Cryptotympana pustulata, and Arctium lappa, all have the ability to dispel wind and relieve the exterior. Schizonepeta tenuifolia and Saposhnikovia divaricata are important herbs for treating wind disorders. They can open the pores and disperse wind pathogens, enabling the wind pathogens in the exterior to be dispersed. Cryptotympana pustulata and Arctium lappa can not only disperse wind-heat but also promote eruption and relieve itching, assisting the monarch herb to enhance the power of dispelling wind, so that the wind pathogens are resolved from the muscle surface. This is a method for treating the symptoms, targeting the main cause of wind pathogens invading the muscle surface.

2. Clear Heat and Dry Dampness, Reduce Fire and Detoxify

Gypsum fibrosum and Anemarrhena asphodeloides clear and drain the heat of the lung and stomach, and Atractylodes lancea and Sophora flavescens clear heat and dry dampness. Wind pathogens are likely to be associated with damp pathogens. Long-term stagnation of damp pathogens is likely to transform into heat, forming damp-heat pathogens. Herbs that clear heat and dry dampness can remove the damp-heat pathogens in the body, prevent the further accumulation of damp-heat in the skin, and aggravate the condition. At the same time, purging fire and detoxifying helps to eliminate symptoms such as local swelling, redness, heat, and pain on the skin. This is a treatment measure targeting the pathological change of wind pathogens associated with dampness transforming into heat.

3. Nourish Blood and Yin, Moisten Dryness and Subdue Wind

Angelica sinensis, Rehmannia glutinosa, and Sesamum indicum nourish blood and nourish yin. Wind pathogens are likely to consume yin and blood, and damp-heat can also damage yin fluid, resulting in insufficiency of yin and blood. Insufficiency of yin and blood leads to malnutrition of the skin and difficult-to-stop itching. Herbs that nourish blood and nourish yin can supplement yin and blood, nourish the skin, moisten dryness and calm wind, and relieve skin itching. This is a method for treating the root cause, targeting the pathogenesis of wind pathogens damaging yin to restore the balance of yin and blood in the human body.

4. The combination of monarch, minister, assistant, and guide, treating both the symptoms and the root causes

The monarch herb mainly dispels wind to solve the superficial syndrome of wind pathogens invading the muscle surface; the ministerial herbs assist the monarch herb to enhance the power of dispelling wind and promote eruption and relieve itching; the adjuvant herbs clear heat and dry dampness, purge fire and detoxify, targeting the pathological change of wind pathogens associated with dampness transforming into heat; the envoy herb nourishes blood and nourishes yin, moistens dryness and calms wind, treating the root syndrome of wind pathogens damaging yin. The whole formula is rigorously combined with the monarch, ministerial, adjuvant, and envoy herbs, treating both the symptoms and the root cause. It can not only quickly disperse wind pathogens and relieve skin symptoms but also adjust the balance of yin, yang, qi, and blood inside the human body to achieve the purpose of curing the disease.

5. Comparison with Other Similar Formulas

1. Comparison with Yinqiao Powder

Yinqiao San (Honeysuckle and Forsythia Powder) It is mainly used to treat the exterior syndrome of wind-heat, with main symptoms such as fever, slightly aversion to wind-cold, sore throat, thirst, etc. Its composition is mainly herbs that clear heat and detoxify, disperse wind-heat, such as Lonicera japonica, Forsythia suspensa, Mentha haplocalyx, Arctium lappa, etc. And Xiaofeng San (Eliminating Wind Powder) Although there are also drugs for dispersing wind-heat, it focuses more on treating skin diseases caused by wind pathogen combined with dampness or internal accumulation of damp-heat, mainly manifested as skin itching, rashes, etc. And the formula contains more drugs for clearing heat and drying dampness, nourishing blood and enriching yin to deal with the pathogenesis of wind pathogen injuring yin and internal accumulation of damp-heat.

2. Comparison with Fangfeng Tongsheng San

Fangfeng Tongsheng San It has the effects of dispersing wind and relieving exterior syndrome, clearing heat and dredging the interior, and is mainly used to treat the syndrome of excessive wind-heat and excess syndrome of both exterior and interior. Symptoms include aversion to cold and fever, dizziness, red and painful eyes, bitter taste in the mouth and dry throat, discomfort in the throat, stuffiness and fullness in the chest and diaphragm, cough, vomiting, asthma, constipation, red and astringent urine, etc. This formula has a strong effect of relieving exterior syndrome and clearing interior heat, and the medication is relatively comprehensive, involving the regulation of multiple zang-fu organs. Xiaofeng San It focuses on skin diseases caused by wind pathogen, with the main effects of dispelling wind and removing dampness, clearing heat and nourishing blood, and mainly acts on the skin and muscles, targeting skin symptoms for treatment.

3. Comparison with Danggui Yinzi

Danggui Yinzi has the main effect of nourishing blood and dispelling wind, and is mainly used to treat stagnation of heart blood, internal accumulation of wind-heat, skin covered with sores and scabies all over the body, swelling or itching, or oozing of pus and water, or red rashes, bumps and tumors. Its composition is mainly composed of drugs for nourishing blood, combined with drugs for dispelling wind and relieving itching. Based on nourishing blood and dispelling wind, Xiaofeng San emphasizes more on dispelling wind and removing dampness, clearing heat and purging fire, and treats the pathogenesis of wind pathogen combined with dampness transforming into heat. In clinical application, it has a better effect on skin diseases accompanied by damp-heat symptoms.

VI. Clinical Applications ( Skin disease ）and indications

1. Allergic dermatitis

Allergic dermatitis is one of the common diseases in dermatology department, mostly caused by contact with allergens, manifested as skin itching, erythema, papules and other symptoms. The effects of Xiaofeng San in dispelling wind and removing dampness, clearing heat and nourishing blood can effectively relieve skin allergy symptoms caused by wind pathogen combined with dampness. By dispersing wind pathogen, clearing internal damp-heat, and at the same time nourishing yin and blood, it can improve the allergic state of the skin, relieve itching and rashes.

2. Urticaria

Urticaria, commonly known as "wind rash", is a localized edema reaction caused by the dilation and increased permeability of small blood vessels in the skin and mucous membranes. Wheal-like rashes appear one after another, with severe itching. The wind-dispelling herbs in Xiao Feng San can disperse wind pathogens, causing the wheals to subside, the antipruritic herbs can relieve itching symptoms, the heat-clearing and dampness-drying herbs can reduce local inflammatory reactions, and the blood-nourishing and yin-nourishing herbs can help restore the normal function of the skin, showing good effects in the treatment of urticaria.

3. Drug Eruption

Drug eruption is an inflammatory reaction of the skin and mucous membranes caused by drugs entering the human body through oral administration, injection, inhalation and other routes. The manifestations of drug eruption are diverse, including erythema, papules, blisters, etc., accompanied by itching or pain. Xiao Feng San can regulate the balance of qi, blood, yin and yang in the human body, clear the wind pathogens and damp-heat pathogens caused by drug allergy, nourish blood and yin to repair damaged skin tissues, thus promoting the subsidence of drug eruption.

4. Eczema

Eczema is a common inflammatory skin disease, characterized by symmetry, exudation, pruritus, polymorphism and recurrence. Xiao Feng San can target the pathogenesis of eczema with wind pathogens combined with dampness and internal accumulation of damp-heat, dispel wind and remove dampness, clear heat and nourish blood, improve the symptoms of skin itching, exudation, erythema, etc. in eczema patients, and reduce the recurrence of eczema.

VII. Modifications

1. Predominance of Wind-Heat

If wind-heat is relatively predominant, Flos Lonicerae Japonicae and Fructus Forsythiae can be added to enhance the effects of clearing heat and detoxifying, and dispersing wind-heat. Flos Lonicerae Japonicae is sweet in taste, cold in nature, and belongs to the lung, heart and stomach meridians. It can clear heat and detoxify, and disperse wind-heat. Combined with Fructus Forsythiae, it can enhance the effect of clearing heat and relieving the exterior, enabling better clearance of wind-heat pathogens.

2. Predominance of Damp-Heat

For those with relatively predominant damp-heat, Talcum and Caulis Akebiae can be added to clear heat and promote diuresis. Talcum is sweet and light in taste, cold in nature, and belongs to the bladder and lung meridians. It can promote diuresis and relieve stranguria, clear heat and relieve summer heat; Caulis Akebiae is bitter in taste, cold in nature, and belongs to the heart, small intestine and bladder meridians. It can promote diuresis and relieve stranguria, clear the heart fire. The combination of the two can enhance the effect of clearing heat and promoting diuresis, effectively removing damp-heat pathogens in the body.

3. Severe Itching

For those with severe itching, Cortex Dictamni and Fructus Kochiae can be added to enhance the antipruritic effect. Cortex Dictamni is bitter in taste, cold in nature, and belongs to the spleen, stomach and bladder meridians. It can clear heat and dry dampness, dispel wind and detoxify, and relieve itching; Fructus Kochiae is pungent and bitter in taste, cold in nature, and belongs to the kidney and bladder meridians. It can clear heat and promote diuresis, dispel wind and relieve itching. They can directly act on the skin to relieve itching symptoms.

4. Obvious Blood Deficiency

If blood deficiency is obvious, the dosages of Radix Angelicae Sinensis and Radix Rehmanniae can be increased, or Radix Rehmanniae Preparata and Radix Paeoniae Alba can be added to enhance the effect of nourishing blood and yin. Radix Rehmanniae Preparata is sweet in taste, slightly warm in nature, and belongs to the liver and kidney meridians. It can nourish blood and yin, replenish essence and marrow; Radix Paeoniae Alba is bitter, sour in taste, slightly cold in nature, and belongs to the liver and spleen meridians. It can nourish blood and regulate menstruation, astringe yin and stop sweating, soothe the liver and relieve pain, and suppress liver yang. Increasing the dosage of blood-nourishing herbs can better nourish yin blood and improve blood deficiency symptoms.

VIII. Dosage (Traditional and Modern)

1. Traditional Method

The traditional usage is to decoct in water for oral administration. Generally, add an appropriate amount of water to the herbs in the formula, soak for a certain time, then boil with strong fire, and then change to slow fire and decoct for a certain time, and take the decoction. The specific dosage of the herbs depends on the condition and individual differences of the patient. Generally, Herba Schizonepetae, Radix Saposhnikoviae, Periostracum Cicadae, Fructus Arctii are each 6g, Gypsum Fibrosum, Rhizoma Anemarrhenae, Rhizoma Atractylodis, Radix Sophorae Flavescentis are each 9g, Radix Angelicae Sinensis, Radix Rehmanniae, Semen Sesami Nigrum are each 6g. Take one dose daily, divided into two times.

2. Modern Concentrated Granules

Modern concentrated granules are granule preparations made from traditional Chinese medicines through processes such as extraction and concentration, which are convenient to take. Their dosage is generally converted according to the dosage of traditional prescriptions and can be taken according to the instructions. For example, Xiaofengsan concentrated granules, each bag is equivalent to a certain amount of crude drug. Generally, one bag is taken each time,冲服 with boiling water, twice a day. Using modern concentrated granules can save decocting time and is convenient for patients to take, but the curative effect is basically the same as that of traditional decoctions. The specific medication can be selected according to the doctor's advice.

IX. Precautions and Taboos

1. Dietary Taboos

During the period of taking Xiaofengsan, spicy, greasy, seafood and other stimulating foods should be avoided. Spicy foods such as chili peppers and Chinese prickly ash are likely to help fire and generate heat, aggravating the pathogenic factor of damp-heat in the body; greasy foods are not easy to digest, which can increase the burden on the spleen and stomach and affect the absorption and curative effect of drugs; seafood foods are mostly hair-triggering foods, which are likely to induce or aggravate skin allergic symptoms and are not conducive to the treatment of diseases.

2. Emotional Regulation

Keep the mood comfortable and avoid excessive mood swings.不良情绪 such as anxiety and depression can cause the qi and blood in the human body to run不畅,加重 the pathogenic factor of wind pathogen and affect the curative effect of Xiaofengsan. Patients should try to maintain an optimistic attitude and actively cooperate with the treatment.

3. Skin Care

Pay attention to skin cleaning and avoid scratching the skin to prevent skin infection caused by scratching. Mild skin care products can be appropriately used to keep the skin moist, but strong刺激性 cosmetics should be avoided. At the same time, wear loose and breathable clothes to reduce friction on the skin.

4. Special Populations

Pregnant women should use Xiaofengsan with caution. Because some drugs in the prescription have certain promoting blood circulation and dredging effects, which may have an impact on the fetus. When children, the elderly and the weak in constitution take medicine, the dosage should be appropriately adjusted according to the specific situation and used under the guidance of a doctor.

X. Modern Research Progress

1. Pharmacological Studies Show

Many drugs in Xiaofengsan have anti-inflammatory and anti-allergic effects. For example, wind-dispelling drugs such as Schizonepeta tenuifolia and Saposhnikovia divaricata can inhibit the release of allergy mediators such as histamine and减轻 the inflammatory reaction; heat-clearing drugs such as Gypsum Fibrosum and Anemarrhena asphodeloides can reduce the permeability of capillaries and减少 exudation, thereby relieving symptoms such as redness, swelling, heat and pain of the skin. Blood-nourishing drugs such as Angelica sinensis and Rehmannia glutinosa can调节 the body's immune function,增强 the body's resistance and contribute to the recovery of the disease.

2. Clinical Research

In recent years, many clinical studies have confirmed the effectiveness and safety of Xiaofengsan in the treatment of various skin diseases. Through the observation of a large number of patients with allergic dermatitis, urticaria, eczema, etc., it is found that Xiaofengsan can significantly improve the skin symptoms of patients, such as reducing itching degree, shrinking rash area, decreasing exudation, etc., and the adverse reactions are fewer. Some studies have also compared the curative effect differences between Xiaofengsan and western medicines in the treatment of skin diseases, and the results show that Xiaofengsan has certain advantages in the comprehensive curative effect and reducing the recurrence rate.

3. Exploration of Dosage Form Improvement

With the development of modern pharmaceutical technology, the dosage form improvement of Xiaofengsan is also constantly being探索. In addition to traditional decoctions and modern concentrated granules, Xiaofengsan capsules, tablets and other dosage forms have also been developed. These new dosage forms have the advantages of being convenient to take and easy to carry on the basis of maintaining the curative effect of the original prescription, and are more suitable for the modern fast-paced lifestyle, providing more choices for patients.

4. In-depth Study of Action Mechanism

Xiao Feng San (消风散), known in English as Eliminate Wind Powder, is one of the most important classical formulas in Traditional Chinese Medicine for treating itchy skin diseases caused by Wind-Heat or Wind-Damp invading the exterior with underlying Blood deficiency. This comprehensive formula disperses Wind, clears Heat, dries Dampness, and nourishes Blood to relieve itching and skin rashes. It is particularly indicated for eczema, urticaria (hives), dermatitis, and generalized pruritus with red, raised lesions that may ooze or form crusts. In modern clinical practice, Xiao Feng San is widely used in TCM dermatology for both acute and chronic itchy skin conditions, especially when symptoms worsen with heat, spicy food, or alcohol, and when there are signs of Blood deficiency such as dry skin, dizziness, or insomnia. By addressing both the exterior pathogenic factors and the internal root of Blood deficiency, it provides effective and lasting relief for many common dermatological complaints.

At present, the mechanism of action of Xiaofeng Powder in the treatment of skin diseases is still under in-depth research. Studies have found that Xiaofeng Powder may achieve anti-inflammatory and anti-allergic effects by regulating the immune network of the body and affecting the expression and release of cytokines. In addition, its effect on improving local microcirculation of the skin and its role in repairing the skin barrier function have gradually attracted attention. These studies will help further reveal the mechanism of action of Xiaofeng Powder and provide a more solid theoretical basis for clinical application.