According to the development of skin lesions, psoriasis can be divided into the stage, resting stage, regression of three periods. In psoriatic lesions may be a sudden outbreak of the short term, quickly over the body, may been the emergence of new skin rash, and skin lesions will continue to expand the original, this time the skin is sensitive, easily lead to "the same type reaction" place. Also known as stable quiescent psoriasis, skin lesions and development of basic stop, gradually narrowing, flattened, scaly be reduced, inflammation is not obvious, blush faded, can be maintained for a long time. In the regression of psoriasis, the rash continue to fade old, scales thin, broken and even disappear, and eventually become a white pigment by light or dark brown stain pigmentation spots.

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