1) Technical principle

Laser irradiation will produce photothermal effect, photochemical effect, pressure effect, electromagnetic field effect and biological stimulation effect on skin tissue, thus causing damage to skin scars. The tissue is rapidly pyrolyzed, vaporized, or broken into tiny fragments, which are swallowed up by phagocytes in the body and excreted from the body, thereby achieving the purpose of smoothing scars.

2) Applicable groups and contraindication groups

① Applicable groups: patients with mild scars.

② Contraindications

a. People with scarred constitution;

b. People with coagulation disorder, low immune function, chronic wasting disease, systemic or local infection People with lesions;

c. People with photosensitivity;

d. People with various mental and psychological abnormalities and endocrine disorders should use with caution;

e. Erythema Use with caution in patients with lupus and vitiligo who are using hormones, salicin, and photosensitivity drugs in the advanced stage and within 1 month.

3) Technical methods

Before treatment, clean the face, mark the scope of scar repair, perform local infiltration anesthesia, turn on the power to preheat the laser, adjust the appropriate parameters, and then remove the lesions Test 1-2 light spots to observe the reaction. If there are no adverse reactions, perform laser treatment on the acne scar area. After the treatment, wrap it with sterile gauze.

4) Risks and complications

① Pigmentation: The mechanism of pigmentation is not completely clear. Most people believe that this phenomenon is secondary pigmentation after inflammation, which is different from that after treatment. It is related to factors such as excessive sun exposure and dark skin color.

② Superficial scars: It may be caused by excessive treatment dose or repeated irradiation of the treatment area, excessive temperature of the cooling head, insufficient skin cooling, and improper postoperative self-care. Scars must be treated promptly after discovery

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③ Infection: After treatment, erythema and exudate may appear on the wound due to scratching or water contamination. Once infection occurs, seek medical attention as soon as possible to promote wound healing as quickly as possible, but superficial scars may remain after healing.

④Pruritus: It is rare and may mean the healing of the wound. At the same time, we should also be alert to the possibility of infection.

5) Treatment and recovery time

The speed of laser scar treatment depends on the area of ??skin that needs to be treated. Generally speaking, each treatment will not take more than 20 minutes, but it may Treatment is required 2 times a week, and *** requires more than 8 treatments. After treatment, the skin color will become closer and closer to the normal skin color, and in some cases it will be darker than the normal skin color. After a few months of recovery, the skin color will be similar to the original skin color.

6) Precautions

① Keep the wound surface clean and dry after surgery, and avoid contaminating the wound surface with water or cosmetics. Avoid strenuous exercise to prevent the wound from stretching and splitting.

② The wound will shed the scab naturally. Do not forcefully remove the scab to prevent scarring.

③ After the scabs fall off, you should avoid sun exposure, photosensitizing drugs and foods are prohibited, and sunscreen can be applied externally to prevent pigmentation.

④ Pay attention to the prevention and treatment of complications such as infection, scars, pigmentation, and purpura.