The etiology of psoriasis has not yet entirely clear, most scholars now believe, is a multiple minor genetic disease, it causes more induced, such as infection, allergy, damp cold, neuropsychological factors, endocrine disorders, decreased immune function and so on. The clinical features, in the basis of erythema, covered with silvery white phosphorus multi-chip, non-infectious, easy-to-recurrence, the importance of psoriasis pathophysiology is accelerated proliferation of epidermal cells, epidermal cells mature and be disturbed, so that skin cell replacement time, measured isotope labeling technique, the normal conversion time of epidermal cells, 26-28 days, while the epidermal cells of psoriasis lesions conversion time is 3-4 days, accelerating the formation of psoriatic epidermal cells, resulting in skin lesions Department of phosphorus product produced thick dust. Consciously itching, itching degree varies, light in only a sense of micro-itch, itching unbearable weight are affected by work and sleep, some patients do not itch, it is usually affected by extensive lesions in patients with tremendous beauty to the spirit of damage.

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