Scar generation: Damage to the whole layer of the skin due to a variety of factors such as surgery, trauma, etc., can leave permanent scars. The scars left on the face usually affect the aesthetics. In the past, the repair of hyperplastic scar scars was either surgical excision, or grinding (mechanical grinding and CO2 laser grinding). If surgical excision is performed, the scar will grow again, and grinding is not very fine. Ultrasound treatment instrument for scar repair uses ultrasonic current which has no side effects on the human body and acts directly on the skin lesion, which can be finely layered and produce complete cavitation, and the lesion can be cleared under intuition. Due to the precision of the instrument and the operator’s unique technique and operating skills, the damage to normal tissues is greatly reduced. Ultrasonic waves can also inhibit the mast cells and collagen fibers that produce scars, and have the functions of sterilization, virus killing, hemostasis and anti-inflammation, so that the wounds will remain flat with normal tissues after healing and are not easy to produce scars. Scientific grasp of treatment timing, in about a month after scar formation, local tissue has grown firmly, fibrous tissue has not yet replaced the incision of the granulation tissue, timely application of ultrasound for skin alignment uneven, uneven height of the scar area for layered cavitation, delicate repair to flat and soft. Ultrasound can stimulate fibroblasts to secrete collagen, so that the skin in the scar area can be quickly reorganized and regenerated in a regular manner, reaching near normal after debridement. Ultrasound in the treatment can coagulate the dilated blood vessels of the scar during the proliferation phase and inhibit the mast cells of the scar to reduce the possibility of scar regeneration. Then, through the later comprehensive treatment, the recurrence of the scar is effectively prevented, and for the scar skin of the sutured incision, from the flatness to the recovery of color and the appearance of skin texture, the appearance reaches close to that of the surrounding skin. The fresh wound repair is quick to remove the scab. In the case of old scars, ultrasound can also be used to repair them, but the treatment is relatively much more difficult. This is because the connective tissue of the full skin incision is significantly proliferated and even widened, mostly in the form of a whitish surface or a hard striped scar with a raised surface. The duration of systematic treatment is also prolonged, but eventually a significant improvement of the scar area can be achieved, and in some cases it takes two treatments to achieve better results.