Hair transplantation was proposed by American doctor Professor Norman in 1959. The principle is that hair follicles from the back of the occipital area still maintain the growth characteristics of the back of the occipital area when moved to other parts of the body and can be used to treat hair loss disorders, which is medically called the donor area dominance theory. The current traditional method of hair transplantation is called FUT, or follicular unit transplantation, which uses surgery to remove the scalp from the back of the occipital area, then separates the hair follicles under a microscope, and then plants them into the area of thinning hair, and this method is more invasive. In recent years, there is a new method called FUE, also called follicular unit extraction, compared with the traditional surgical method, using a very fine hair extractor, directly extracting individual hair follicles, and then planting the extracted hair follicles to the thinning hair area, the operation is simple, and no surgery, no sutures, and the healing time is also very fast, so FUE is the new trend of hair transplantation in recent years, and there are also PTT hair transplantation technology and There are also PTT hair transplantation and SHT hair transplantation without traces. The effect of hair transplantation varies from person to person, the primary purpose of hair transplantation is to solve the problem of hair density, there are many reasons affecting hair density, mainly depending on how many units of hair the patient can take out from the back of the occipital area, which is often referred to as the donor condition. After the hair transplant, the tiny trauma formed by extracting the implanted hair follicles will not form any scars, and after 6-9 months of hair growth, it will be impossible to distinguish the implanted hair from the unimplanted hair.