Psoriasis is a Chinese medicine disease. According to its occurrence mechanism and clinical symptoms, it can be mainly divided into liver depression and fire (liver qi is not smooth, leading to fire and heat), wind-dampness embedded in the skin, and blood deficiency and wind dryness. 1. Liver depression and fire: mostly caused by emotional trauma, liver depression and stagnation of qi (liver qi and blood transport is not smooth, emotional depression), long time to turn into fire, fumigation of the skin caused by the visible lesions of red color, accompanied by upset and easy to get angry, insomnia and dreamy, bitter mouth and dry throat and so on. 2. Wind-dampness skin: mainly by the wind-dampness of the evil evil accumulation in the skin, resulting in local qi and blood stagnation, skin loss caused by the visible lesions were light brown flaky, rough and thick, itchy, and especially at night. 3. Blood deficiency, wind and dryness: if blood deficiency generates wind and dryness, it can lead to skin loss of nourishment and develop into this disease, which can be seen as grayish skin lesions, scratching like withered wood, rough and plump like cowhide, accompanied by palpitation and palpitation with anxiety (heartbeat is intense, panic and restlessness), insomnia and forgetfulness. Psoriasis is a kind of affected part of the skin is like the skin of the bull collar, thick and firm chronic itchy skin disease, its identification and treatment should be combined with the patient’s own specific conditions by the physician, not blindly self-medication.