Etiology of psoriasis is genetic factors and environmental factors in the results, that is the basis of genetic factors induced by many factors Suozhi, 1984 national epidemiological survey of psoriasis, who had family history 32%, its mode of inheritance is autosomal dominant inheritance, and its influence rate of 20%. Blood Heat is a major source of psoriasis occurred, but the formation of blood there are a variety of hot factors: internal injury can be due to the impassioned, Qi Yong Zhi, Yu years of heat, so Firelight Kang Sheng, drug fever or blood in the camp V Disloyalty diet, overeating, drug rehabilitation by wind-heat evil and disease. Hot obstruct blood contact is made erythema, dry air containing heat, skin dystrophy; the rash scaling, color white and the itch; Yin and Blood internal friction if the disease for a long time, won the subsidized burning liquid, then dry and hard of blood in the outer wing; blood loss and, blocking the skin dystrophy meridians; if blood containing toxic hot burning evil foreign attacks, steam burning the skin, blood two burnt, the fire fled Yu, Ji Zhi skin to form erythroderma. Common triggers are:

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