I. What is photorejuvenation? Photorejuvenation is known as intense pulsed light treatment in medical aesthetics. It uses the photochemical effect produced by pulsed photons to stimulate the skin and cause the collagen fibers and elastic fibers in the dermis to produce chemical changes in their molecular structure, increase in number, rearrange and restore their original elasticity. Second, photorejuvenation and freckles. With the introduction of photorejuvenation (intense pulsed light), the treatment of freckles has undergone an epoch-making transformation. Most patients can say goodbye to freckles completely after only 2-6 sessions with 3-4 weeks interval each time. The principle of intense pulsed light treatment for freckles: selective photothermolysis. The energy of photons is only selectively absorbed by the pigment vesicles in freckles, which are broken up in an instant with blasting effect. The broken melanin dust is either shed with the skin flakes or phagocytosed by macrophages and discharged from the body with lymphatic circulation. Note: The skin after intense pulsed light treatment is not more afraid of the sun than before. But you must develop the habit of sun protection to avoid the heart’s freckles from growing out again. The advantages of photorejuvenation for freckles. 1.There is only slight pain in the treatment, most people can tolerate it. 2. The treatment time is short, 15-20 minutes per treatment. 3.Fast recovery after treatment, no missed work period, lasting and stackable treatment effect. 4.Non-exfoliative physical treatment, highly directional, accurate action site, no damage to surrounding tissues and skin appendages. 5, adapt to different skin state, safe and effective, will not cause damage to the skin. Fourth, the contraindications of photorejuvenation lactation, pregnancy, malignant tumor, serious internal diseases, photosensitivity and connective tissue disease patients. If you have had prolonged outdoor activities (e.g. hiking, swimming, skiing, etc.) within 2 weeks, it is recommended that you undergo treatment after 2 weeks to prevent discoloration. V. Will photorejuvenation make my skin thinner and more sensitive? Neither. Photorejuvenation activates skin fibroblasts through photothermal action, increasing collagen expression, causing structural changes, increasing the number of collagen fibers and elastic fibers, and rearranging them. Therefore, instead of thinning the skin, photorejuvenation will increase the thickness of the skin and make the skin tighter and more elastic, transforming it towards youthfulness, and will not lead to increased skin sensitivity. Will photorejuvenation produce dependence? No, it will not. Many people think that photorejuvenation will create dependency and that it will rebound or worsen if you don’t do it. These views are not true. All we do is to slow down the aging process. To get more desirable results, multiple treatments or maintenance treatments are inevitably needed, it is not that we become dependent on the laser.