The side effects of fractional laser include hyperpigmentation, infection, burns, scar formation and other side effects. 1. Hyperpigmentation: after fractional laser treatment, if you don’t pay attention to sun protection or infection occurs during improper care in the healing process, it may cause local hyperpigmentation. 2. Infection: Since fractional laser is invasive treatment, if the aseptic operation is not strict in the treatment process or the care is not proper after the treatment, there may be the risk of trauma infection. 3. Burns: If the energy is not properly adjusted during fractional laser treatment, it may cause excessive local heat, resulting in thermal burns of the skin. 4. Scar formation: Fractional laser will create countless tiny wounds on the skin, infection during the healing process or keloid people may lead to scarring of the wound. Fractional laser is recommended to go to regular medical institutions for treatment, and after treatment, strict attention should be paid to sun protection and scientific care to avoid adverse consequences.