Fractional laser treatment is not allowed for scarring. Fractional laser technology is a laser technology based on the principle of focal photothermal action, which effectively stimulates and induces collagen reorganization and regeneration, helping to improve skin texture. Fractional laser technology is an invasive laser treatment that carries the risk of potential scar formation and is therefore contraindicated for use on scarred individuals. In addition, fractional laser technology is not applicable to patients with severe diabetes, hypertension; psychiatric patients; patients with active vitiligo, psoriasis and other skin diseases; menstruation, pregnancy or breastfeeding; light allergy and so on. And strict attention should be paid to sun protection after treatment.