Laser going to work is still effective, but it may cause side effects due to individual quality differences, congenital genetic bacteria, metabolic level, living habits, laser equipment specifications, nursing matters and other factors. Usually, beauty seekers with dark skin and brown skin are more prone to pigmentation after laser treatment than those with white skin. Yellow and brown will appear again after laser. In addition, hypertrophic rosacea, solar keratosis, facial patches, acne, acne and other scars can be achieved by laser grinding. Laser can stimulate the production of collagen, so we can't use collagen before and after beating to avoid skin damage. Zeng Sheng or Ban Dian Jia Chong.