Psoriasis vulgaris is the most common form of psoriasis in clinical practice, mostly with acute onset and rapid spread throughout the body. The initial damage is often a red or brownish-red papule or macule. Later, it gradually expands and becomes a brownish-red plaque. The lesions are covered with dry scales. The borders are clear and adjacent lesions may fuse with each other. Symptoms of psoriasis vulgaris: The scales of the disease are silvery white and gradually thicken, and scraping away the scales can reveal a translucent film, which some people call the film phenomenon. When the film is peeled off, it appears to bleed in spots, which is called the punctate bleeding phenomenon. The film phenomenon and punctate bleeding are now symbolic and specific for the diagnosis of psoriasis. In some patients, the scales are thick and hard, oyster shell-like, and can interfere with the stretching of the skin. The thick, hard scales break easily on the joint surfaces, causing the skin to crack and feel painful. Some patients with psoriasis have pathological changes in internal organs. Patients with psoriasis may have occlusive vasculitis, abnormalities in the lungs, hepatic steatosis and focal necrosis, keratoconjunctivitis, and male patients may have changes in semen quantity and quality. Visceral damage in psoriasis patients should all be taken seriously in the treatment of psoriasis.