Psoriasis skin damage thickening and crusting is not a period of recession, suggesting that the disease may be in the stationary period. Psoriasis according to its course in the clinical mainly divided into progressive, stationary and receding period, the initial manifestation of red papules later gradually expand, become brown-red plaque, surrounded by inflammatory reaction, the surface covered with dry white scales, scrape off the surface of the scales appeared translucent membrane known as thin film phenomenon, scrape off the thin film after the appearance of a relatively small bleeding point. Psoriasis appears large blood red plaque with white material, these white material is easy to fall off, after psoriasis slowly recover, the white material will be scabbed off naturally, suggesting that the condition is in a stationary stage. For patients with psoriasis, it is recommended to consult the dermatology department of the regular hospital for treatment.