Psoriasis is a chronic inflammatory relapsing skin disease that tends to develop or worsen in the fall and winter months, while long-term illnesses can have no seasonal pattern. There are four types, and the most common type is the common type. The triggers or aggravating factors for the onset of common psoriasis are: dry skin, scratching skin, infection, cold, strain, mental stress or tension, trauma and medication, etc. Preventing relapse or alleviating relapse is the difficulty and key to treatment. For decades, our department has always insisted on skin-specific treatment, namely, persistent skin self-care, gradual regression of topical drugs, intermittent phototherapy, and induction of immune tolerance. 1, persistent skin self-care Whether during the onset or remission (lesions recede), insist on daily bathing, tub bath is better than shower, the water temperature should not be too high. When the temperature is lower than 30℃, use moisturizer such as “Yuzhe skin barrier repair agent body lotion” after bathing, and insist on it for a long time; it is better to use it after phototherapy; if it occurs on the face, insist on using “Yuzhe” facial essence lotion after washing the face. Persistence can prevent recurrence or reduce the degree of recurrence. There are two types of topical medications that are commonly used: those that contain glucocorticoids and are used for a short period of time, and those that do not contain hormones and continue to be used after the disease has subsided to consolidate the effect. At the first visit, physicians will give hormonal creams or ointments with varying efficacy, such as “compound fluorouracil cream”, “compound chloramphenicol betamethasone cream”, etc., which are usually used for more than a week to show significant improvement, and can be discontinued or reduced in frequency and replaced by or combined with non-hormonal topical medications. The use of non-hormonal topical drugs such as “carboplatinol”, “calcipotriol”, etc. can be discontinued or reduced and replaced by or combined with non-hormonal topical drugs. There is another type of non-hormonal topical drugs with strong efficacy, such as “Tacrolimus”, “Pimecrolimus” ointment, etc., especially for the face, vulva and other special areas, after the healing can be “weekend therapy”. After healing, it can be used as “weekend therapy”, i.e. 1-2 times a week for external application on the primary site. This principle is also followed for psoriasis of the scalp, with topical application of “compound clobetasol liquid” first and “carbotriol application” after healing. 3. Intermittent phototherapy is recommended for the widely distributed punctate rash, the cumulative area of the rash exceeds 10% of the body surface area, and those resistant to topical medication, including whole-body or half-body narrow-spectrum medium-wave ultraviolet radiation (NB-UVB), whole-body or localized photochemotherapy (PUVA). Before treatment, careful understanding of the phototherapy process and precautions to be taken during and after phototherapy, such as sun protection, diet, and medication status, is required from the phototherapy nurse to prevent adverse reactions. Once phototherapy has started, it is not recommended to stop treatment before the end of the regular course, unless there is a rare case of “photosensitive psoriasis”. The regular course of treatment is 18 to 24 times, no less than twice a week, so that the effect can be achieved as soon as the dose of light increases. Contact your phototherapy nurse or doctor in the event of a post-phototherapy adverse reaction. Do not apply any topical medicine or moisturizer before each phototherapy to maximize the effect; use “Yuze” type skin barrier repair agent as soon as possible after phototherapy to reduce UV damage to the skin and itching. 4.Other For punctate and some plaque psoriasis, skin test can be conducted to determine whether it is related to bacterial infection, and those related can be treated by inducing immune tolerance. Patients with recurrent tonsillitis, sinusitis, odontitis and intense itching should contact a specialist physician specializing in psoriasis in a timely manner.