A, the role of strong pulsed light strong pulsed light, that is, the said photons, it is different from the laser, is developed on the basis of the laser non-laser type of strong pulsed light. Compared with the laser, its spectrum and pulse mode is different: laser for a single wavelength of light, and intense pulsed light for the spectral range of 560nm-1200nm a broad spectrum of light, it is more than a single wavelength of laser can penetrate different depths of tissue, and it uses pulsed light rather than a single light effect, a pulse of energy dispersed into 2 to 3 sub-pulses for treatment, sub-pulse between This multi-pulse form can better protect the epidermis from burns than the single pulse form of laser, so it is better than laser in its indication range. Intense pulsed light (i.e., photons) can cross the epidermis and selectively act on the deeper skin tissues, which are highly targeted to pigments in the skin such as melanin and hemoglobin. When a specific wavelength of photons acts on the skin, they are selectively absorbed by these pigment-containing tissues and converted into heat energy, resulting in photothermal effects that cause these tissues to be absorbed by pyrolysis or crusted off, thus being able to treat certain pigmented disfiguring This enables the treatment of certain pigmented disfiguring diseases. At the same time, it can stimulate the fibroblasts of the skin to enhance their synthesis ability and change the structure of collagen fibers and elastic fibers, which can make the skin delicate and have the effect of smoothing small scars and eliminating wrinkles, so it has a wide range of uses in the field of medical cosmetology, and can be used to beautify the skin and for the treatment of some cosmetic diseases. The main reason is that different wavelengths of pulsed light are selectively absorbed by different target tissues through the principle of photothermolysis. It can be used for the treatment of capillary dilation because it causes coagulation and finally leads to vascular occlusion. The skin’s pigmented lesions: melanin absorbs heat energy and undergoes pyrolysis, partly crusting off and partly being absorbed and metabolized by the macrophages in the skin, so it can also treat pigmented skin diseases. The pigmented diseases that can be treated by photorejuvenation therapy mainly refer to freckles and pigmented spots, of which the best efficacy is freckles. Permanent hair removal: The longer wavelength pulsed light can be absorbed by the hair follicle and hair shaft, and cause irreversible destruction of the hair follicle structure. Therefore permanent hair removal can be achieved. Excessive hair on the upper lip for women, beard for men, or body hair such as armpit hair, excessive hair on limb parts. ④Improve skin quality: It is not only used for the treatment of fine wrinkles, but also for the pacification of shallow and small skin scars, such as red marks and small scars left after acne. 3. Intense photon treatment cycle 1. Facial treatment: generally five times as a course of treatment. More than three weeks are needed between treatments. Because the light energy will be absorbed by the skin to produce photothermal effect, a treatment intensity can not be too large, can not be repeated in the same part of the treatment, otherwise the skin can not tolerate, too much intensity will appear serious erythema or even blistering, therefore need to be treated several times, due to the different shades of skin and skin absorption degree differences, each person needs a different number of treatment, generally to achieve satisfactory results need to be after 3 -4 times, some need more than one course of treatment, but each time the symptoms will appear a certain improvement. 2, hair removal: hair in various parts are in different growth stages, the proportion of hair in different parts of the growth period is different, in general, about 20-70% of the hair in the growth period, and thereafter into the excessive period, rest period, because the photon hair removal is to the melanin in the hair as the target tissue, so it is only on the hair in the growth period, that is to say It only works on the part of the hair that is currently visible on the body surface, and does not work on the resting hair. After each treatment, it takes 1-1.5 months for the resting hair to grow out before the second hair removal. Therefore, one treatment cannot solve the problem completely. Generally five sessions of photorespiration can reduce hair by more than 90%. Therefore, generally need to go through 3-5 times of treatment. Fourth, strong photon treatment after the operation of adverse reactions. The correct operation will not cause skin damage. Because of the short pulse width, low pulse energy density, plus the time delay between multiple pulses, and the treatment head has a synchronous cooling function, the treatment site is also coated with cold gel cooling, and based on its “selective photothermolysis” principle, the specific wavelength of light is only absorbed by melanin and hemoglobin, so to ensure that the normal This ensures that normal tissues are only stimulated to a certain extent and not damaged. The immediate reaction after the treatment is: the skin in the treatment area is slightly red, there is a certain burning sensation, the dilated capillary part can disappear immediately, and the pigmentation area is darkened and thinly crusted, which is the normal reaction of the treatment. After the operation, ice or cold spray will be applied, and the redness and burning sensation will disappear after the same day or 2-3 days. The pigmentation scab will fall off in 7-10 days without leaving any scars, and the postoperative effect is more ideal. At the same time, the structure and arrangement of collagen fibers and elastic fibers of the skin are changed, so that the texture of the skin is gradually improved, the shallow wrinkles and scars gradually fade, and the appearance of the skin is delicate and elastic. After the surgery, if you pay attention to sun protection and avoid inappropriate physical stimulation such as scratching and rubbing as required by the doctor, it will not cause adverse reactions, so it is a relatively safe technique. In addition, if the treatment is improper or the parameters are too strong, the skin will be burned and blistered, which can generally subside after 3-5 days, and the pigmentation will take 3-6 months to subside. Therefore, the standard operation is the key to avoid adverse reflections and complications, need to go to the regular hospital treatment. V. Contraindications of intense pulsed light treatment. Generally speaking, pregnant women, people with acute solar dermatitis, people who are using photosensitive drugs, people with diabetes, and people with scarring should be listed as relative contraindications. In addition, clinical data show that for darker skin tones, and often tanned face is slightly less effective, postoperative pigmentation is also prone to occur, so it is best not to use.