I. The concept of eczema (eczema) is an inflammation of the superficial dermis and epidermis caused by a variety of internal and external factors. The etiology is complex and is generally considered to be related to allergic reactions. Its clinical manifestations are characterized by symmetry, exudation, pruritus, polymorphism and recurrence. According to the different symptoms of eczema sites can be divided into calf eczema, scrotal eczema, breast eczema, hand eczema, etc. The true cause of the disease is not well understood in Western medicine. It is generally believed that a variety of internal and external factors interact to cause eczematous changes. It may be related to genetic factors, dietary factors, environmental factors, infection factors, drug factors and so on. The cause of this disease is more clearly understood by Chinese medicine, the internal and external dampness and the combination of the two evils, internal dampness because of dietary disorders, alcohol or excessive eating fishy and windy products, injury to the spleen and stomach, spleen loss of health, resulting in dampness and heat within; external dampness is external wind and dampness and heat, internal and external two evils fighting each other, filled in the coup, soaked skin caused by the development of acute eczema. Or a weak body, spleen and stomach wet trapped, skin loss of nourishment, or damp-heat contained for a long time, depletion of Yin and blood, dryness and wind, resulting in blood deficiency and wind dryness, skin A wrong and prolonged, become subacute or chronic eczema. Third, the clinical classification and performance (a) acute eczema (acute eczema) manifested as primary and polymorphic rash. Often on the basis of erythema there are pinhead to corn-sized papules, papules, and in severe cases there are small blisters, often fused into patches, the boundaries are not clear. At the periphery of the damage, the papules are gradually spreading. The rash is symmetrically distributed, mostly on the face, ears, hands, feet, forearms, and exposed parts of the lower legs, and in severe cases may diffuse throughout the body. Self-perceived pruritus is more severe. The rash is often scratched to form a punctate vesicular surface, with obvious plasma exudate. If secondary infection occurs, pustules, pus, pus crusts, enlarged lymph nodes, and even fever and other systemic symptoms are formed. (B) subacute eczema (subacute eczema) after an acute attack, redness and exudation is reduced, but there can still be papules and a small amount of papules, the rash is dark red, there can be a little scaling and mild infiltration. This is the subacute stage. Sometimes acute attacks or exacerbations may occur due to re-exposure to allergens, new irritation or improper treatment. If it does not heal over time, it will develop into chronic eczema. (C) chronic eczema (chronic eczema) from acute eczema and subacute eczema, or since the beginning of the inflammation is not heavy, dark red spots with papules, scratches and scales. The affected skin is hypertrophic, rough and mossy, with hyperpigmentation or hypopigmentation. The disease may be mild or severe, and may last for several months or longer. Preferred sites: hands, feet, calves, elbow fossa, femur, breasts, vulva, anus, etc., more symmetrical occurrence of glass due to different lesion sites, the performance varies. Diagnosis According to the characteristics of polymorphism, oozing tendency, intense itching and symmetrical distribution of the original disease in the acute stage, and moss-like changes in the chronic stage, it is not difficult to diagnose. V. Treatment Because the etiology of this disease is not well understood by Western medicine, the treatment is still only symptomatic and cannot fundamentally cure the disease. Anti-inflammatory, antipruritic, topical hormone creams and so on. The Chinese medicine believes that the disease is mainly divided into three types: (a) damp heat immersion type is equivalent to acute eczema, clinical manifestations for the onset of the rapid, flushed lesions burning, itching, oozing juice, accompanied by body heat, heartburn, thirst, dry stool, urine short red tongue, thin white or yellow coating, smooth pulse. The treatment is to clear heat and relieve dampness. The formula is based on Gentian Diarrhea Liver Soup or Dioscorea Z Infiltration Dampness Soup with addition and subtraction. (2) Spleen deficiency and dampness type is equivalent to subacute eczema. The onset of the disease is slow, with flushed lesions, itching, erosion and oozing after scratching, and scaling may be seen, accompanied by poor appetite, fatigue, abdominal distension and loose stools. The tongue is light with white or greasy coating and the pulse is slow. Treatment is to strengthen the spleen and relieve dampness. The formula is based on the addition and subtraction of De-Dampness and Stomach Ling Tang or Ginseng and Atractylodis Macrocephalae. (3) Blood deficiency and wind dryness type is equivalent to chronic eczema. The lesions are dark or hyperpigmented, itchy, or with rough and thick skin. It is accompanied by dryness of the mouth and lack of desire to drink, poor appetite and abdominal distension, pale tongue with white fur and thin string veins. The recipe is Angelica Drinking Son or Siwu Dissipative Wind San plus or minus. Six, prevention 1, acute eczema avoid hot water and soap and other irritants wash coated affected areas. 2, avoid scratching, avoid eating spicy and irritating food, avoid smoking and alcohol. Try to eat less or do not eat seafood, beef and mutton and other hair products. 3, it is best to eat less sweets, because sweets can damage the spleen and stomach, so that the body produces wet trigger the occurrence of eczema. 4, infant eczema, mothers also avoid eating spicy, beef, mutton, fish, seafood and other hairy products.