1、 Principle of Q-switched laser treatment
Based on the principle of photo explosion, the high energy gathered by the laser is emitted instantaneously, so that the laser with a fixed wavelength can instantly penetrate the epidermis to reach the diseased tissue in a very short time. The corresponding color groups absorb light energy and expand rapidly when heated, and the color bases of the diseased tissue will gradually fade until they disappear, The surrounding normal skin tissue has almost no damage because it does not absorb the fixed wavelength laser.
2、 What problems does Q-switched laser solve?
1. Treatment of freckles: freckles are speckled, sesame shaped brown or light brown spots. The laser emitted by the Q-switched laser can smoothly penetrate the skin on the lesion, enter the lesion site, and treat the pigment on the lesion site. During treatment, the pigment of the freckle completely breaks and disintegrates under the powerful laser irradiation, and then makes it dissipate by itself.
2. Treatment of nevus of Ota: nevus of Ota is a birthmark. It is generally distributed around the eye socket, producing patches or spots of blue, brown, black or mixed colors. Laser treatment of nevus of Ota is to use the selective photothermal effect of light on objects of different colors, and use lasers with different nanometer values to selectively act on melanocytes in the dermis, so that they can be instantly heated to gasification and crush, while other tissues of the skin will not be damaged, so as to remove melanin.
3. Rinse tattoos, lip lines and eyeliner: Nowadays, due to unstable pigments, design errors, fashion changes and other reasons, more and more people require to remove tattoos, lip lines and eyeliner. When Q-switched laser with a specific wavelength acts on artificial dyes, the dye molecules are vaporized, crushed, and discharged out of the body, making the color of tattoos fade away, which will be seen at the time of treatment.
4. Treatment of port wine stains: port wine stains are common on the face, neck and scalp. Q-switched laser technology uses hemoglobin in blood vessels to selectively absorb the energy released by the laser of a specific wavelength, leading to vascular damage and complete destruction, while the surrounding normal skin tissue is rarely absorbed, so it can achieve the ideal effect of eliminating vascular skin lesions without damaging normal tissue.
In addition, Q-switched laser can also treat sunspots, seborrheic keratosis, moles, coffee spots, and post inflammation pigmentation; Ito nevus, Mongolian spot, blue nevus; Chloasma, melanosis, and some pigmented nevi.
3、 Does pigment spot treatment need to inject anesthetics?
During the operation, the person receiving treatment will have a slight sense of acupuncture, and does not need to use anesthetics. However, for some large tattoos, nevus of Ota and other treatments, because of the long treatment time, some patients can be given local topical anesthesia to reduce pain, without the need to inject anesthesia.
4、 How about the effect of Q-switched laser treatment for color spots?
Generally speaking, the effect of laser treatment of nevus of Ota, freckles and senile plaques is ideal, but not all pigmented diseases can be eliminated by laser. For example, the most common chloasma (commonly known as liver spot) in oriental women is generally in dynamic change, and it usually reappears or even worsens after laser treatment. Freckles or senile plaques have a good treatment effect, but if you do not do a good job in sunscreen, it may also recur.
5、 Advantages of Q-switched laser speckle removal
1. Selective treatment without damaging normal skin;
2. The treatment time is short and has no effect on work, life and study;
3. No side effects and sequelae;
4. Efficient and safe.
6、 Treatment course of Q-switched laser
The fading time of pigment particles after laser treatment is generally 3-6 months. Due to the individual differences in the size, type, depth, color, skin color, metabolic capacity, age and other aspects of the plain color particles of different pigmentary diseases, the time and degree of the disappearance of the pigment particles after laser treatment are also different. The lighter the lesion, the younger the age, and the earlier the treatment, the better the effect. Usually, the interval is 2-3 months. Generally speaking, superficial pigmented diseases such as freckles and senile plaques need 1-2 times, and deep pigmented diseases such as nevus of Ota need 5-10 times.
7、 Precautions for Q-switched laser spot removal
1. Some lesions require multiple treatments.
2. Scars may appear after treatment.
3. The treatment site shall not be wetted for 5-7 days to prevent infection.
4. Temporary pigmentation or depigmentation may occur in the short term after treatment, and will disappear after several months.
5. After treatment, pay attention to sunscreen at the treatment site (especially within 1 month).
6. A small area of stain may appear slightly swollen locally after treatment. Significant swelling will appear especially around the eyes during treatment of large-area stain, which usually disappears after 3-5 days.
7. After treatment, there may be slight redness, swelling and brownish scabs. Attention should be paid to the wound protection and cleaning. Some lubricating drugs can be used to make the scab peel off by itself.
