Intense pulsed light (Intense pulsed light, IPL), also known as “photorejuvenation”, was formally approved by the U.S. FDA for clinical use in 1995, so far there have been 20 years, can be said to be the oldest photomedical cosmetic technology. Although it is not a new technology, it is respected by all cosmetic dermatologists and widely used in clinical practice. As for the reasons, please see the picture: First, what is intense pulsed light? What is intense pulsed light? Intense pulsed light is not a laser, is produced and emitted by the flash lamp a wavelength of 500 ~ 1300nm strong composite light, its nature is similar to daylight, part of the visible light, part of the near infrared light. Clinically, according to different treatment requirements, in the treatment of different filters (built into different treatment head, or filter), filter out part of the wavelength of the light, access to different intervals of light for treatment, such as the treatment of vascular diseases, select the 590nm filter, can filter out the wavelength of 500 ~ 590nm between the light, access to wavelengths of 590 ~ 1300nm composite light, to strengthen the relevance of the treatment. Enhance the relevance of treatment. Second, what is the role of intense pulsed light? Intense pulsed light can be broadly divided into five categories: 1, vascular diseases, such as capillary dilatation, bright red nevus, facial flushing; 2, pigmented diseases, such as sunlight black, freckles, chloasma, age spots, coffee spots, post-inflammatory hyperpigmentation; 3, photo-aging skin problems (that is, skin rejuvenation), such as fine wrinkles, skin roughness, enlarged pores, dull skin color; 4, depilatory (except for beauty salons) However, except for beauty salons, very few hospitals use IPL for hair removal. Why? Because we have more high-end equipment ~); 5, acne and rosacea (rosacea). What is the principle of IPL treatment? Although intense pulsed light is not a laser, but its application principle is the same as the laser, following the principle of selective photothermal effect and extended selective photothermal effect. When treating vascular diseases or hair removal, the mechanism of action is the same as that of laser. However, due to the very wide pulse width of IPL, the principle of treating pigmented diseases is different from that of Q-switched laser, which follows the principle of selective photothermal action, and is more in line with the principle of extended selective photothermal action. The mechanism is that pigment vesicles absorb the energy of intense pulsed light and then transmit it to pigmented skin lesions, resulting in denaturation and natural turnover of cells in the lesions due to thermal action, i.e., pigment vesicles as the color base and the entire skin lesion as the target site. In terms of “skin rejuvenation”, its mechanism of action has not been clearly stated, from the existing research results, is for intense pulsed light through selective photothermal effect leads to dermal collagen damage, damage repair process is initiated, directly promote the fibroblasts in the type Ⅰ and Ⅲ pre-collagen mRNA transcription, increase the collagen content of the dermis, thus improving the texture of the skin, to achieve “skin rejuvenation”, to achieve “rejuvenation”. Texture, to achieve the effect of “rejuvenation”. What are the side effects of Intense Pulsed Light? Will the skin become more and more sensitive? Will the skin become more sensitive and thinner? Intense pulsed light treatment of a very big advantage is that there are almost no side effects, very safe. Will not make the skin more and more sensitive or thinner, on the contrary, the thickness of the skin after several treatments, will be due to the dermal collagen proliferation and thickening. However, there is a potential risk of causing pigmentary changes in the skin. A small number of people may develop hyperpigmented spots, and a very small number of people may develop acne-like rashes and blisters. Therefore, the treatment should be carried out in a regular hospital and abuse is not allowed. The kind of intense pulsed light as absolute safety, unlimited exaggerated efficacy, even in the beauty salon on the treatment is irresponsible, patients should be avoided. Fifth, do intense pulsed light pain? Yes, there is a little pain, but completely tolerable. In fact, pain is a reference for doctors to judge whether the treatment is effective or not. Six, how long is the treatment time of IPL? Will the treatment affect my work? A single treatment usually takes only about 20 minutes. The skin will be reddened after treatment, which can be relieved by icing for half an hour in general. Where there are spots on the face, the color of the spots will deepen and crust over, which will usually fall off in about 5 days. Because the treatment can be normal skin care makeup, so almost does not affect the work. Do I need special skin care after IPL treatment? No, only need to do a good job of sunscreen and moisturizing. At the same time, it is recommended to use skin care products under the guidance of a doctor, including stopping the use of all functional cosmetics (including a variety of blemish cream, wrinkle cream, etc.), prohibit the use of a variety of chemical exfoliation treatment (also known as peeling treatment), prohibit skin grinding and the use of scrubs and cleansers. Eight, I am sensitive skin, can I do intense pulsed light treatment? Yes. In general, intense pulsed light therapy is very safe, almost no contraindications, but the following patients should be careful treatment: 1, light-sensitive people and recent application of light-sensitive drugs, this person is sensitive to light, treatment is prone to skin damage. 2.Pregnant women, because the treatment has different degrees of pain, theoretically can not completely exclude the potential impact on fetal development may exist. 3.Systematic use of retinoic acid (at least 2 months after the cessation of use before treatment). This group of patients may have a potential temporary weakening of skin repair function. Patients with very high expectations. Although intense pulsed light has outstanding cosmetic ability, but it is only a very common medical program, do not exaggerate and deify, no ability to change the nature of your skin, do not hold unrealistic expectations. Will my skin age faster after I stop IPL treatment? No. Weiss RA et al. had a return visit to 80 patients 5 years after IPL treatment, and the result was that 83% of them still felt that the skin texture had improved, 82% felt that the capillary dilatation had improved, and 79% felt that the skin was fairer. X. Is there any contraindication after IPL treatment? Can I eat soy sauce? Eat eat eat. Can I eat seafood? Yes! Can I eat eggs? Yes! Is soy sauce okay? Yes!