Raid first used the Q-switched ruby laser in 1983, mainly for blue and black and some non-professional tattoos. Different colors of tattoos require different lasers to get rid of them, and no one laser can get rid of all colors. Laser treatment of tattoos is mostly based on the wavelength complementary to the choice of treatment wavelength. It is recommended that you choose a laser to treat your tattoo according to its main color and see the results. Please consult the dermatology or laser department of a medical institution with appropriate laser equipment. After the treatment area is sealed with 5%/EMLA anesthetic ointment for 40-50 MIN, the anesthetic is removed, disinfected with 0.5% iodophor and cleaned with saline, and then the laser beam is applied vertically to the tattoo area after the skin is dry. Immediately after the operation, an ice pack was applied to the area for 10 min. The treatment interval was 2-3 months, and the follow-up period was 6 months. The parameters are set according to the age of the patient, the site of the lesion, the shade of the color, the reaction that occurs after the laser irradiation of the skin, causing an immediate yellow-white change in the skin, followed by mild edema, without or with mild oozing of blood. Various laser uses: a certain energy density of 2.0-5.5J/cm2, spot size 3-4mm2. 1, Q-switched Nd:YAG laser treatment. Laser wavelength 1064mm, pulse width 10ns, mainly for the treatment of black, blue-black, blue tattoo treatment treatment. 2, Q-switched QS532 laser treatment. Laser wavelength 532nm, pulse width 5nm, mainly treats red, yellow and brown tattoos. 3, Q switch QS755 laser treatment, laser wavelength 755nm, pulse width 75nm, mainly for the treatment of green, blue, brown, black and other tattoo treatment. A variety of tattoo color laser options: black, gray-black, blue melanin available for Q-regulated Nd: YAG1064nm laser treatment; blue-black, brown, green and coffee available for Q-regulated emerald 755nm laser treatment; red tattoo pigment available for Q-regulated multi-frequency Nd: YAG532nm laser removal, but the relative removal of the slower. The laser is used to remove pigment by selecting the color of the tattoo through the principle of selective photothermolysis and color complementarity, that is, the pigment particles in the skin under Q-switched laser irradiation, absorbing the instantaneous high energy of the laser, causing the pigment particles to vaporize and be fragmented, while the cell frame can be retained intact. At the same time, because the laser pulse time is shorter than the thermal relaxation time of the skin tissue, the instantaneous single pulse laser energy release process is completed in about one millionth of a second, so that the newly generated heat is not transmitted to the surrounding tissues and epidermis, and the lesion tissue is eliminated by the thermal effect while the surrounding healthy skin tissue is not damaged. During the subsequent inflammatory response, some of the particle debris is filtered and eliminated directly into the capillary lymphatic vessels, and some of it is phagocytosed by macrophages and eliminated by acidic hydrolytic enzymatic degradation. The cells from which the pigment particles were removed can be quickly repaired on the basis of a more intact cellular framework. The longer the wavelength, the deeper the laser action on the tissue. The color particles of the tattoo are in the dermis, thus longer wavelengths have a greater effect on the melanin in these dermal tissues, while having little effect on the epidermis. If the tattoo is not traumatic and the pigment used is free of red, most tattoos can be completely removed without leaving a trace. Generally speaking, the more metal ions in the pigment, the more times the treatment is required. Clinically, it is common to see that after two or three treatments of thick black tattoos, most of the thick black color has been removed, but the red pigment remains. This is mainly because the pigment contains iron and chromium plasma is difficult to remove. Laser treatment should pay attention to the standard, to prevent excessive irradiation, to laser irradiation immediately appear gray-white and point-like oozing blood is appropriate. After the laser treatment, the interval should be two to three months and then again. The effect is better when the pigment is concentrated and distributed in a linear pattern after two to three months from the pathological section. The principle of the laser is to break up the pigment, which is then engulfed by phagocytes or absorbed by other means. The actual treated patient can still see the pigment from the slice, but it is too small to be seen by the naked eye. Many people worry about the after-effects. In fact, if the procedure is performed by a professional doctor, it is unlikely that problems will occur. Generally speaking, it is easy to have the problem of darkening or whitening of pigmentation, so the safer way is to conduct a trial treatment. First, we will use different energy to hit several spots. After a few weeks of observation, we will see which energy is most suitable for the treatment. After the surgery, you should pay attention to sun protection and other care, which can minimize the occurrence of adverse reactions. The actual laser treatment post-operative care should be paid attention to: the trauma is coated with Bactrim ointment, keep the trauma dry, clean, generally are not bandaged, such as the trauma is large or not easy to expose parts can be properly bandaged, while giving oral antibiotics, such as Rijun Sha, Pioneer, etc., avoid sun exposure and strenuous exercise, prohibit cosmetics, to avoid trauma pigmentation. The shortcoming of laser is that it is expensive and takes a long time. However, the patient has less pain and less damage, and female patients especially prefer laser treatment. Usually about 3 laser treatments are sufficient for tattoos. Depending on the size of the area, the cost varies and is more expensive than tattoos.