The ideal method commonly used to treat nevus of Ota is laser. Instead of damaging all the epidermal cells, laser treatment directly acts on melanocytes selectively, causing melanosomes to be phagocytosed and carried away. Therefore, laser treatment for nevus of Ota has the advantages of no local scars after treatment, easy operation, treatment on the go, no incision, no hospitalization, etc. Generally, after the treatment of nevus of Ota with the new emerald laser, the immediate reaction of the lesion area of nevus of Ota is grayish white, unlike the early Nd:YAG 1064 laser, there will not be obvious bleeding at the treatment area. After the treatment of nevus of Ota, we should pay attention to local protection and prevent scratching to avoid scarring, individual patients have hyperpigmentation or hypopigmentation. If the new emerald laser laser is used to treat nevus of Ota, to achieve the ideal effect, most doctors with experienced technology can achieve it in two or three times, but after all, there are so many medical uncertainties that no one dare to say for sure, so we can only say most, not absolutely. Moreover, for nevus of Ota, the deeper the pigmentation of the lesion, the better the effect and the less the treatment course. However, in general, the effect that nevus of Ota is close to being cured without leaving scar can be achieved in the end. Although many so-called theories repeatedly emphasize that the younger the age, the thinner the skin, the stronger the metabolism, and the stronger the absorption ability, the better the effect. However, the actual statistical analysis results do not show that there is a significant difference. On the contrary, if the treatment is carried out at a younger age, the more intolerant the patient is to pain, and if they are intolerant, they will not cooperate, and if they do not cooperate with the doctor, even if they want to do it seriously, they will not be able to do it, so the effect will be even worse, which will lead to more and more times to do it. Laser treatment for nevus of Ota can be painful, there is no painless laser, and the actual situation is that even after using local anesthesia, there will still be some pain. However, the characteristic of the new emerald laser is that the treatment speed is very fast. For the same area, it takes more than half an hour to treat with the old Nd:YAG 1064 laser, but with the new laser, if you are an experienced doctor with good technology, you can finish it in a few minutes to ten minutes, and the operation is very convenient, so although it is still painful, the time is obviously shortened, which is very helpful for the patients. Of course, for infants and children, I generally recommend that there is no need to treat so early, but many parents are anxious, must be treated, according to my more than ten years of experience, must be treated, I generally use a different large spot low energy treatment with adults, low energy, pain can also be lighter, but the number of times to be more, generally adults with small spot high energy, most two or three times, but large spot low energy generally to do Seven or eight times or more. Contraindications: 1. pregnant women; 2. people with photosensitive skin; 3. people with diabetes; 4. people suspected of having skin cancer; 5. people with keloid. Precautions: 1. Keep the treatment area clean to avoid infection and friction. 2. If there is demented skin on the treatment site, it should fall off by itself, do not remove it by hand, otherwise the newly grown skin will be more red, and the pigmentation will be serious, and it will easily leave scars. 3.After the scabs fall off, there can be a brief local pigmentation, but it can generally subside after medication. 4. Pay attention to avoid excessive exposure to the sun. Post-operative care The treatment should be carried out in several sessions, with each treatment lasting about ten minutes, and the skin of the treatment area should be cleaned and disinfected before the operation. Before the scab falls off, pay attention to keep the wound clean, and the treatment area should not be touched with water after surgery, and the wound should only be cleaned with topical drugs every day. The new skin should be taken care of, avoid prolonged exposure to the sun, and use cosmetics carefully. Do not take aspirin-based drugs for a period of time after treatment, as this may affect the recovery of the skin. Do not drink alcohol or eat irritating food for two weeks.