Symptoms of psoriasis: erythema, white scales, thin films, punctate bleeding, itchy skin, etc. The symptoms of psoriasis – from Baidu Encyclopedia It starts out as an inflammatory red papule, about the size of a corn to a green bean, and gradually expands or fuses into a brownish-red plaque with clear borders, surrounded by an inflammatory red halo, with a distinct basal infiltrate and covered with multiple layers of dry grayish or silvery-white scales. Gently scrape away the surface scales, gradually reveal a layer of light red shiny translucent film, called film phenomenon. If the film is scraped away again, small bleeding spots will appear, which is called punctate bleeding phenomenon. White scales, shiny film and punctate hemorrhage are important features for the diagnosis of psoriasis, which is called the triad of signs. Lesion morphology: punctate, coin-shaped, map-like, ring-like, band-like, generalized, seborrheic dermatitis-like, eczema-like, oyster shell-like, flat moss-like, chronic hypertrophic, warty, etc. The key to treating psoriasis: identify the cause and treat it symptomatically. There are many factors that cause psoriasis, and there are different therapies for different causes, and there are many different types of psoriasis, and different therapies for different types, factors, and properties. The treatment of psoriasis must first be diagnosed and then a treatment plan must be developed before treatment is carried out.