Remove freckles laser or photon Preferred

Doctor who: Miss Ma

complaints: Hello experts! I have a lot facial freckles , because these my freckles and no self-confidence, how is it treated?

Air Force General Hospital laser cosmetic surgery Center Expert Q & A: freckles often occur in exposed areas, especially in the face, especially nose and cheeks is most common. To impede the appearance of freckles by laser or IPL for treatment.

laser treatment of freckles can be used Q-switch Alexandrite laser, wavelength 532nm SHG Nd: YAG laser or semiconductor laser. Laser does not damage normal skin in the case of a specific wavelength of the light beam through the skin, precise spot direct root damage to pigment cells and pigment granules, fragments of macrophages by treatment in vivo absorption, security, leaving no scars. After a thorough use of laser treatment, freckles basic will not grow again.

and IPL the application is a pulsed light source, especially for Asians, and other types of skin pigment treatment, the principle of laser speckle similar. Its unique treatment of a wide spectrum of light into the skin, so that the pigment freckles and pigment cells to heat, freezing and wither, to achieve the desired speckle effect.

no matter how remove freckles will have a slight scar, but this does not affect facial cleaning and care, to be scab fall off naturally, with no need to lay-off and leave, very convenient. In general, the laser treatment is usually carried out 1-2 times you can see significant improvement in results; IPL needs to be done 3 - 5 treatments, 1 every 3 weeks. Remind people of beauty, strong sunlight can cause freckles the color deepened, and the patient must pay attention to sun protection.

Common laser hair removal

1 . alexandrite laser wavelength 755nm , the absorption peak wavelength of melanoma, and to transmission into the dermis. Long pulse can be used for hair removal .

2 . semiconductor laser wavelength 800nm ?? long-pulse laser semiconductor for hair removal .

3 . Nd:-YAG laser wavelength 1064nm long-pulse hair removal for .

Beauty hair removal by laser

traditional hair removal methods of shaving, plucking, chemical hair removal and wax hair removal, etc. , the effect is temporary. Although electrolysis can permanently hair removal hair removal , but the cure rate is low, side effects, such as the formation of scar tissue, and of sweat gland secretion. A new generation of Beauty Laser machine can be effective and permanent hair removal, the principle is the base of the hair and hair follicle growth and hair matrix, containing the hair growth phase a lot of melanin, selectively absorb a specific wavelength of laser, the laser irradiation, laser energy is selectively absorbed by hair matrix accurately without causing damage to adjacent tissue injury, permanent hair removal to purposes. At present the ideal hair removal device has lightSheer semiconductor laser, its wavelength is longer, penetrate deeper, longer exposure time, can undermine the efficient and accurate location of the deeper hair matrix and hair follicles, the treatment head and also synchronized with the sapphire cooling system, it is more secure. There are also 694 nm long-pulsed ruby ??laser, 755 nm alexandrite laser and 1064 nm Nd: YAG laser system can also be effective in hair removal.

the body's hair follicles in different growth cycles, the laser treatment, hair follicles in the dormant period will not be affected. Such as the hair follicles into the growth phase only produce more melanin after the laser to work, so from time to time after the treatment several times before they need to do to achieve long-term effects. After 2-6 times of treatment, most patients receive a permanent effect, even a small amount of regeneration, regeneration of the hair is also less than the original thin, short and light color, then that has reached clinical purposes. In general, the thicker and darker hair (such as the armpits and men's beards, body hair, etc.) the effect of laser treatment; while the smaller (as some lip hair thin women) and the effect of light or even white hair poor. In addition, the first facial hair because a higher proportion in the growing season, so fewer treatments required, otherwise the limbs, bikini hair at the higher number of treatments required; head and facial hair also due to short growth cycle, so that treatment is only about 1 month interval, whereas the limbs, the perineum of hair is required interval of 2-3 months. Another study showed that, laser hair removal after the histological structure of sweat glands are not destroyed, the clinical observation of patients with sweat gland function is also not affected. Laser hair removal virtually no side effects.

Laser hair removal, once and for all

laser hair removal is hair removal by destroying hair follicles play a role in melanin within the hair follicle growth phase in most of the laser emitted the strongest absorption, laser hair removal to determine the best role of target. The more melanin, the more clear, the higher the hit rate, the greater the destruction of hair follicles.

everyone is obsessed with a smooth skin, so many kinds of cosmetic products such as river carp, dizzying, but trapped in the lip hair, hand hair, leg hair long There is much to people who are the other plus armpit hair, pubic hair, etc., in order to fast, quick removal of these small plush, traditional hair removal Act removed the clip from the simplest to the shaving method, patch, wax hair removal, chemical reagents hair removal , EA hair removal, etc., there are people willing to try. Their role is only temporary, common drawback is that regeneration of hair quickly.

electrolysis (electriolysis) and thermal dissolution method (thermolysis) although the effective destruction of hair follicles, but the operation is cumbersome, time-consuming, low efficiency, low efficacy, significant pain and possible shortcomings left scars. To be effective, convenient and safe removal of unwanted hair surface, based on principles of selective photothermolysis, a variety of laser systems have been designed and intense pulsed light source system that allows people to accept a large area hair removal treatment significantly reduced discomfort, and to scar formation and other complications to a minimum. The use of modern optical technology has been able to achieve permanent hair removal reduction purposes.

early as 60 years, Goldman first described ruby ??laser damaging effects of melanin on the hair follicles, but not for clinical, 80 Ohshiro described ruby ??laser treatment nevi after the hair loss, but skin and causing serious injury. In 1993, Harvard University Medical Optics Laboratory Wellman started using ruby ??laser hair removal research, followed by ruby ??laser, Nd: YAG laser hair removal treatment for clinical succession, but their design is also less than ideal parameters. Wellman Laboratories of Medical Optics in 1997 started a new generation of laser hair removal machine-LightSheer semiconductor laser hair removal device for clinical treatment, and achieved remarkable results. , The new intense pulsed light hair removal treatment systems began to be used, since the optical hair removal technology has been basically mature.

1 Principle of laser hair removal

the principle of laser hair removal is still Based on theory of selective photothermolysis. Hair follicle and hair shaft are rich in melanin, melanin distributed in the hair bulb matrix between cells, and also the structure of the hair shaft to the transfer (such as the medulla, cortex and cuticle). Melanin as a target of laser can precisely and selectively target hair removal treatment. Melanin in the absorption of laser energy, the temperature rapidly increased, resulting in tissue damage around the hair follicle, the hair removed.

under the theory of selective photothermolysis, just select the appropriate wavelength, pulse width and energy density, the laser can accurately without causing damage to the hair follicles adjacent tissue damage. To achieve the effect, it is clear above the hair bulb and the bulge (in the sebaceous hair follicle openings and setting of muscle attachment between the hair follicle outer root sheath, where is the location where the hair follicle stem cells) in melanocytes must be light therapy . ① deeper parts of the hair bulb, decided to use longer wavelength, light penetrates deeper treatment. On the other hand, if the wavelength is too short, the epidermal melanin in the hair follicle melanin will absorb more energy competition, which can lead to skin damage. Therefore, to ensure better absorption of light known as the black, while the wavelength of the laser hair removal is better to 695-1064 nm. ② To achieve high efficiency of the hair follicle damage is obviously a solution to increase the laser irradiation time. In theory, by lengthening the laser pulse width, close to the hair follicles of the thermal relaxation time can improve efficacy, the longer pulse width, the tiny structures, such as epidermal melanosome injury less likely, and relatively large any color hair follicle structure, and its more vulnerable to injury within the melanocytes. The diameter of the hair follicle is about 200-300μm, the thermal relaxation time of hair follicles 40-100ms. Therefore, the ideal laser pulse width should be in the tens of milliseconds to 100 milliseconds. A recent study found that patients with dark skin for more than 100ms pulse width laser, not only has better efficacy and fewer side effects.

hair growth cycle and the relationship between hair removal treatment: ① by laser catagen, no effect on quiescent hair, only the other of these Laser hair to work into the growth period, so the laser hair removal requires multiple treatment, the effect can be significant. ② If a part of the small proportion of hair in the growing season, the number of treatment should be increased. Conversely treatment times can be reduced. ③ Based on different parts have different hair growth cycle, there are differences between each treatment interval. Such as head hair has a relatively short period of resting, so the interval of time can be as short as l month; trunk and limbs relatively long hair resting, so treatment interval to February or so. ④ the depth of hair follicles varies by location, such as the depth of deep to be used longer wavelength laser treatment, whereas shorter wavelength can be used, such as shallow depth of the laser treatment. ⑤ If a part of the hair follicle density is too high, then the treatment should be appropriate to reduce the laser energy.

2 laser hair removal treatment

Laser Hair Removal indications and contraindications: laser hair removal for all parts of the dark and light hair, but the white hair is invalid.

the following is the relative contraindications of laser hair removal:

① has a history of keloids;

② infection in the treatment area or a history of herpes simplex infection;

③ in 6 weeks, had used other means (such as wax off) hair removal patients;

④ hydroquinone or other bleaching agent allergy;

⑤ within 6 months using Lsotretinoin (13 - cis retinoic acid) history.

preoperative preparation: For darker skin type Ⅲ - Ⅴ skin type patients before surgery to avoid sunlight as much as possible, preferably with sunscreen for 4-6 weeks, there pigmentation tendencies also can be added with hydroquinone drugs prevention. In addition, the treated area of ??skin preparation before surgery completely shave the hair, and its role are:

① treatment area can reduce the absorption of some laser hair occurs because of discomfort caused by coking

② can reduce odor emissions from burning hair.