According to the development of skin lesions, psoriasis can be divided into to, stationary, regression of the three periods. In psoriatic lesions may be a sudden burst of the short term, quickly covered the body, may been the emergence of new skin rash, and skin lesions will continue to expand the original, this time more sensitive skin, prone to "isomorphic response" place. Also known as stable quiescent psoriasis, skin lesions develop basic stop, gradually narrowing, flattened, scaly be reduced, inflammation was not obvious, flush faded, can be maintained for a long time. In the regression of psoriasis, skin rashes been dissipated old, scaly thin, broken and even disappear, and eventually cut short the white spots or dark brown pigment pigmentation spots.

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