I. Before treatment 1. Avoid sun exposure two weeks before surgery, otherwise hyperpigmentation and scarring will easily occur. 2. Develop the habit of applying sunscreen, i.e.: (1) Use sunscreen no matter what the weather is, regardless of spring, summer, autumn or winter, because even in winter, the dose of long-wave ultraviolet rays (UVA) is still at a high level, and only medium-wave ultraviolet rays (UVB) have decreased; (2) Apply sunscreen even though you stay indoors all day (because indoor fluorescent tubes also emit UV rays, and if you stay indoors (3) If outdoor activities are longer, you should reapply a layer of sunscreen every 2-3 hours, because the effectiveness of sunscreen will decay; (4) The correct method of application is to place a soybean or peanut-sized sunscreen in the palm of your hand, apply it in a circle and pat it on your face, so as to avoid blocking the pores of the sunscreen; (5) Physical sunscreen containing (5) Physical sunscreen containing zinc oxide and titanium dioxide can block both UVB and UVA, and is the best choice; (6) A good sunscreen will not contain lead, so there will be no hyperpigmentation or lead dermatitis; (7) Sunscreen will not cause fatty grains, so the eyelids (upper and lower eyelids) should also be applied. 3.The use of fruit acid products, L-VC serum and hydroquinone cream from two weeks before surgery will help to whiten the skin tone, improve the skin’s self-renewal ability and increase the therapeutic effect of laser/intense light. 4.The better the hydration status of the skin, the more obvious the improvement will be after the treatment. Therefore, it is important to correct the dry skin state before the operation by using living water, strong moisturizing cream and moisturizing mask (3 times a week). 5. Certain people are not suitable for laser/intense light treatment, such as pregnant women, breastfeeding women, patients with malignant tumors, endocrine disorders (such as hyperthyroidism, etc.), serious cardiovascular or other systemic diseases, mental disorders, unrealistic illusions about the efficacy of the treatment, keloids, and inability to follow medical advice well. Second, after treatment 1, immediate skin care, will minimize redness, soothe pain, reduce skin temperature, to avoid discoloration. You can take the living water, water retention mask, human-like collagen mask wet compress, apply epidermal growth factor gel. In case of fractional/image-beam and other perforating laser treatments, topical L-Vc serum can be applied together with wet compresses. Because the punching laser will form many micron-sized holes in the skin, the absorption of the skin will increase 20-30 times. 2.It is best to carry out a wet compress once a day within 7 days after the operation. 3.If the redness and swelling of the skin is heavy after surgery, you can use soft hormone creams topically for 3 days (such as Ketinol or Utrol). Take oral prednisone/Jadroxol or non-steroidal anti-inflammatory agents (such as Cilazol etc.) for 3 days. 4. Sun exposure and strenuous exercise should be avoided for 1 month after surgery. 5.The intake of spicy and spicy food (such as seaweed, sea cucumber, beef and mutton, etc.), photosensitive food or medicine should be avoided during the postoperative recovery period 6.Avoid skin massage, fumigation, medicinal bath and other items after surgery. 7.To avoid post-inflammatory discoloration, continue to use depigmentation agent for 1 month after surgery. 8.The skin will be somewhat red and swollen on the day of treatment, which will disappear naturally within about 24 hours; you can wash your face and put on makeup the day after treatment, but try to protect the crusted area; a very thin crust will appear on the original part after treatment, which will fall off completely after about 5-7 days; the crust is best to fall off naturally, do not pick off the crust by hand to avoid leaving scars and pigmentation. Temporary pigment loss or hyperpigmentation will gradually return to normal after treatment, and the time varies from person to person; if pigmentation or aggravation of pigmentation occurs during treatment, treatment can be suspended, and the pigmentation or aggravation will naturally subside in 3-6 months. 9. Some diseases may cause temporary small blisters or large blisters, try not to break the blisters to avoid infection. Once the blister is broken, disinfect it regularly (iodophor 1-3 times a day), do not close the bandage, and apply scalding cream or gentamycin ophthalmic ointment, Bactrim, Listerine, etc. 10, regular follow-up. In addition, once any condition occurs, you should immediately return to the doctor for face-to-face consultation to avoid delaying the condition or taking a detour.