Laser treatment side effects are relatively small, the most common may be localized scarring or pigmentation, but also varies from person to person, mostly seen in the keloid, as well as laser treatment after exposure to the sun patients.1, localized scarring: laser treatment for different needs have different choices, the size of the laser energy is also under strict control, the general postoperative will not leave a scar. However, if the operation is not professional, or the patient himself is a keloid, there may be scarring; 2, localized pigmentation: this situation may be a kind of stress reaction of the skin to the laser. But generally in the postoperative 2-3 months, this phenomenon of hyperpigmentation will gradually reduce or subside, but for the laser treatment of local skin exposure to the sun patients, may lead to hyperpigmentation is difficult to subside; 3, burn the skin: laser treatment of erythema, blisters, and even subcutaneous tissue is burned, this is a relatively rare case, it is possible that in the course of the treatment, the laser energy is too large due to the; 4, other: After laser treatment due to a variety of factors, there may also be some rare side effects, such as local pain, wound infection, wound bleeding and so on. In addition, after laser treatment, you need to pay attention to skin moisturizing and sun protection to avoid dryness or sunburn, which will lead to the patient’s discomfort. If there is broken skin, you need to pay attention to wound cleaning to prevent infection. After laser treatment, you should also pay attention to a light diet and avoid spicy and stimulating food.