Dilatation is a landmark technical innovation in the field of plastic surgery, and this method has been widely used in the plastic surgery community. To facilitate some readers to understand the intricacies, I will describe it in the simplest language possible. What if a scarred skin is removed and a wound is formed and we want to repair it? If the wound is small and the surrounding skin has some elasticity, it can be directly pulled together and sutured, so that the original lamellar scar appearance becomes a linear incision and the appearance is improved; what if the wound is large and cannot be directly pulled together and sutured? At this time, there are also various local skin free mobilization methods, because the greater the range of skin and base free, the greater the range of skin elasticity, such as doing various local flap transfer methods, is to free and mobilize more skin, sometimes can achieve the effect of direct suture; if the trauma is really very large, simply not suitable for direct suture, how to do? This is a very common plastic surgery problem, before the invention of expanders, we need to make autologous skin grafts, of course, this method is still used today, is still very important and the main means of repair, but this method has its disadvantages, one is that the autologous skin needs to be thicker, so that the transplanted area will have a slight scar, but even if the scar is slight, there will also be a “patch “The other disadvantage is that the thicker skin area (donor area) can also leave a very visible scar. Dilatation was created to remedy both of these deficiencies. Dilation utilizes a silicon capsule (dilator) that expands. The capsule routinely has a catheter and valve through which saline can be injected repeatedly and several times with a relatively fine needle to gradually expand it. The surgery is performed in two stages, the first stage is to bury the dilator under the normal skin around the scar that needs to be removed, the surgical plan needs to be determined before the surgery, and the normal skin in this area will be used to cover the area after the scar is removed. Each time the amount of water injection depends on the patient’s tolerance of pain and the blood flow of the skin in the dilated area to determine, because as the dilator continues to increase, the skin on its surface will also continue to be expanded and hyperplastic, in the rapid expansion will appear pain, local skin due to excessive tension will appear white, poor blood flow performance, then we must stop the injection, wait a few days, the hyperplastic skin can adapt and soften, so that you can inject water again. When a certain volume is reached, the hyperplastic skin is expected to be sufficient to cover the scar excised wound, the second phase of the surgery can be performed, which is to excise the scar and remove the expander at the same time. When the expander is removed, there will definitely be a surplus of skin in the expanded area, and the surgery is completed by using the surplus skin to transfer to repair the scar excised wound. At this point, you can see that the original lamellar scar becomes a linear incision, and there is no additional scar in the donor area. Dilatation is not a panacea and has its strict indications. Because the dilator injection takes longer to expand, it tends to squeeze the tissue or organs in the area, and if more serious consequences of such squeezing are foreseen, it is not suitable for dilatation. Some patients do not have more time and energy to patiently complete the dilation process and are also not suitable for this method. This method needs to be considered at the discretion of the physician and patient depending on the condition.