1.Intense pulsed light (IPL) Introduction: Intense pulsed light (IPL) or pulsed light or photon, is a high intensity light emitted by a light source (commonly used flash), after focusing and filtering to form a certain wavelength range of high energy light (broad-spectrum light), and through the pulse mode of emission of high energy light. IPL is one of the most widely used light treatment technologies in the clinical field, and occupies a very important position in the field of skin beauty, widely used for photo damage and photo aging related skin diseases, i.e. classical type I and type II skin rejuvenation. Type I rejuvenation: It is IPL treatment for pigmented skin diseases and vascular skin diseases. Pigmented dermatoses include freckles, melasma, sunspots, freckle-like nevus, etc.; vascular dermatoses, including capillary dilation, rosacea, bright red nevus, hemangioma, etc. Type II rejuvenation: It is IPL treatment for diseases related to dermal collagen tissue structure change, including wrinkles, enlarged pores, rough skin, and tiny depressed scar left behind due to various inflammatory diseases such as acne, chicken pox, etc. 2.Why can intense pulsed light (photon) be “cosmetic”? Intense pulsed light is used to achieve cosmetic skin effects through the “theory of selectivephotothermolysis”. The theory of selective photothermolysis was proposed by American physicist and skin laser expert Anderson in 1983. If a certain wavelength of light with sufficient energy can be absorbed by the target chromophore (e.g. hemoglobin) to the greatest extent, while other chromophores absorb little, then the target chromophore can be destroyed through photothermal action, while affecting other chromophores as little as possible to achieve a certain treatment purpose and produce as little non-thermal effect as possible. The effect of the light and heat can destroy the target chromophores while affecting the other chromophores as little as possible to achieve a certain therapeutic purpose and produce as little non-therapeutic effect as possible. For example: hemoglobin can absorb more 540-560nm wavelength intense pulsed light, while other tissue chromophores absorb very little, so you can use 540-560nm wavelength intense pulsed light to treat vascular skin diseases, such as: capillary dilation, rosacea, bright red nevus, hemangioma, etc., and generally will not produce pigmentation, scars and other side effects. 3, strong pulsed light (photon) in skin beauty advantages: because strong pulsed light is a high energy broad-spectrum light emitted through the pulse mode, with high energy, broad-spectrum and pulse mode emission characteristics. The pulsed emission allows the energy to be transmitted when the light is emitted and the tissue to be cooled down when the pulse is delayed, ensuring the safety of the treatment. In addition, broad spectrum can solve not only the main causes of cosmetic problems, but also the secondary causes of cosmetic problems and improve skin aging symptoms, and has the ability to solve multiple factors that cause cosmetic problems, which is “comprehensive and outstanding”. For example, in addition to melanin production by epidermal melanocytes, many patients also have the cause of dermal superficial vascular expansion. If you choose laser with obvious wavelength of melanin absorption (e.g. 694nm), the effect on dermal blood vessels is limited, and the treatment effect may not be very satisfactory; while intense pulsed light with wavelength of 540-950nm can target both the cause of melanin and the cause of blood vessels, and may achieve satisfactory effect. In addition, since the penetration depth of light above 600nm wavelength can reach the dermis, it can heat the collagen fibers and lead to the proliferation and rearrangement of collagen fibers, which can increase the skin elasticity, improve small wrinkles and improve the skin quality while treating melasma. Therefore, intense pulsed light (photon) has the technical advantage of solving multi-cause skin beauty diseases while significantly improving skin aging. 4.What do I need to pay attention to before the Pulsed Light (Photon) treatment? In order to obtain satisfactory results and prevent and reduce adverse reactions, the following matters need to be noted before receiving intense pulsed light treatment: ① No history of sun exposure 2 weeks before treatment; ② No photosensitive drugs 1 week before treatment. Such as: retinoids (including Avia), quinolone antibiotics (such as: norfloxacin, ofloxacin, ciprofloxacin, sparfloxacin, etc.), sulfonamides, tetracyclines (such as memantine), chloramphenicol, ramifon, sedatives (such as: chlorpromazine, isopromazine), psychotropic drugs (such as: fenadine, carbamazepine), diuretics (such as tachyphylaxis, hydrochlorothiazide, aminopterin), hypoglycemic ③ Previously photosensitive or photosensitive patients cannot receive intense pulse light treatment; ④ Stop skin care products containing fruit acid or vitamin A acid for 1 week; ⑤ Thoroughly clean facial skin before treatment, wash off skin care products, dust and shed keratinocytes; ⑥ Remove contact lenses, necklaces, earrings before treatment; ⑦ Need to wear protective glasses before treatment. 5, strong pulse light (photon) after treatment precautions: (1) immediately after treatment, skin care, the purpose is to reduce the treatment site skin temperature, reduce the inflammatory response, avoid hyperpigmentation and shorten the skin recovery period. Cold spray, external ice, external collagen, hyaluronic acid mask, etc. can be used; an ice pack can also be applied outside the mask for 10-15 minutes to enhance the cooling effect; (2) within 1 week after treatment, adhere to the external mask once a day; (3) if the redness and swelling are more serious after treatment, external soft hormone can be used for 1-3 days; (4) after treatment, pay attention to sun protection (especially within 2 days after treatment). (5) Small and thin scabs may appear after treatment (inconspicuous), which generally fade in 2-7 days and cannot be uncovered by hand; (6) No alcohol and spicy stimulating food after treatment. (7) If there is no obvious redness or swelling the day after treatment, wash your face gently with cool water and use non-stimulating moisturizing skin care products; (8) Avoid working in front of a computer for a long time within 3 days; (9) Avoid facial massage and topical exfoliating skin care products; avoid using whitening and blemish-removing functional skin care products; avoid sauna. (9) avoid facial massage, external exfoliating skin care products; avoid the use of whitening, spot removal and other functional skin care products; avoid sauna and other sweaty activities; (10) special problems, to contact the doctor in a timely manner. (6) Intense pulsed light (photon) treatment course Intense pulsed light treatment course mainly varies according to the treatment of different diseases, but also with individual differences. ① capillary dilation, chloasma: 3-4 weeks treatment once, 3-5 times in a row; ② acne: once a week, 3-4 times in a row; ③ rosacea: once in 4 weeks, 3-5 times in a row; ④ pigmentation: once in 4 weeks, 3-5 times in a row; ⑤ skin rejuvenation: once in 4 weeks, 3-5 times in a row.