At present, laser technology is more mature and widely used in the field of dermatology treatment and cosmetology, its treatment range is precise and damage to surrounding tissues is minimal, but in the actual application process, there are also certain side effects. 1, facial redness and swelling, wound bleeding: just after laser treatment, there is usually facial redness and swelling, as well as wound bleeding, oozing, through cold compresses and topical ointment, salve, can be quickly repaired; 2, wound infection: if not properly cared for, there is a certain chance of wound infection. 2, wound infection: if the care is not proper, there is a certain chance that will cause wound infection, should avoid the wound with water, keep the face clean and dry; 3, hypopigmentation, hyperpigmentation: usually temporary changes, about 3 months can be self-relieved, you can supplement some vitamin C, vitamin E, eat more fresh fruits and vegetables, beneficial to recovery; 4, allergic reaction: some patients after laser treatment caused local Allergic reaction: some patients after laser treatment caused local allergic reaction, rash, causing itching, stinging sensation, should follow medical advice to use anti-allergy drugs; 5, scar: usually related to improper care, laser treatment wound scab, recovery period can not be torn by hand to pull the scab, should wait for its natural fall, otherwise it is easy to leave a scar. The possibility of scarring will be effectively reduced after following the medical advice for care.