Precautions before treatment 1. 1 month before treatment, avoid sun exposure or outdoor SPA; 2. 2 weeks before treatment, do not do laser, dermabrasion, fruit acid peeling beauty project; 3. inflamed, pus-filled skin is not suitable for treatment; 4. for people who take oral A acid, it is recommended to stop taking it for 3 months before starting the treatment; 5. for people who use topical A acid creams or spot removal products, it is recommended to stop taking it for 2 weeks before starting the treatment; 6, If you have a history of photosensitivity, skin lesions or immune system abnormalities, or if you are pregnant or taking special drugs, do not do it; 7. Those who cannot accept the risk of treatment will not do it. Treatment must first consult a physician after the course of treatment. Precautions after treatment 1. No special skin care is needed, but it is recommended to use skin care products under the guidance of doctors, including stopping the use of all functional cosmetics (including various spot removal creams, wrinkle removal creams, etc.), prohibiting the use of various chemical peeling treatments (also known as peeling treatment), prohibiting skin grinding and the use of scrub cleansers, etc.; 2. Avoid washing with hot water for a few days after photoluminescence spot removal, you should Use warm and cold water to clean. It is forbidden to do facial massage care during phototherapy to prevent the skin stratum corneum from thinning in the process of massage and thus prone to redness; 3. Since pigmentation spots and various kinds of photoaging are caused by sunlight exposure, sun protection and the use of sunscreen are important. The standard SPF>30 of sunscreen and the double sunscreen containing PA++ to ++++ will be effective; 4. After treatment, because the absorption ability of the skin is enhanced and the metabolism is accelerated, some patients may have dry and dehydrated skin, so skin care is required after surgery to replenish sufficient moisture and nutrition. As far as possible, select skin care products that moisturize and promote repair; 5. Very few patients may experience local redness and swelling after receiving treatment, which will generally disappear on its own in 24-72 hours, keep the wound clean, and apply topical antibacterial ointment for symptomatic treatment. If necessary, go to the hospital in time; 6. Some people will have a slight crust after treatment, which will generally fall off within 1-2 weeks, do not pick it off by yourself; 7. Some patients will have a transient increase in pigmentation after treatment.