With the development of information, many hair loss patients have learned some ways to treat hair loss from the Internet: taking medicine, applying medicine, and hair transplantation. Some people are afraid of the side effects of medication, and it is too troublesome to apply medication, so some people come directly to consult “can I have a hair transplant?” Here, I would like to introduce the timing and indications of autologous hair transplantation. We all know that if we transplant someone else’s organ or tissue into our body, the body will have a rejection reaction and the transplanted tissue or organ will be completely destroyed by our body unless we take immunosuppressants. It is for this reason that for hair loss patients, we can only remove hair follicles from the patient’s own non-hair loss area and plant them into the hair loss area, which is called autologous hair transplantation, which can also be understood as a way to remove the east wall and mend the west wall. So is autologous hair transplantation suitable for all hair loss disorders? The answer is no. There are many different types of hair loss disorders, and the treatment and prognosis for different causes of hair loss are different. Here is a brief description of the diseases that are suitable for autologous hair transplantation. The absolute indication for autologous hair transplantation is scarring alopecia. The so-called scarring alopecia refers to permanent damage to the scalp hair follicles and the formation of scars due to various causes, such as burns, scalds, infections, and some inflammatory diseases. Hair transplantation can be performed after these causative factors are eliminated and the skin tissue is healed. Because the blood supply of scar tissue is not as good as normal tissue, the density of each hair transplant should not be too high, and depending on the patient’s needs, 1-3 more replantings can be performed to be able to achieve good results. Missing eyebrows and eyelashes can also be transplanted. Further, androgenetic alopecia, which is also known as seborrheic alopecia before. If hair transplantation is to be performed, a prerequisite should be noted that the hair loss has been controlled and will not continue to progress in order to obtain a better and lasting result. The control of hair loss can be done by taking BofA, topical Mandy, or if the disease itself has been stabilized. The reason for this requirement is that if the treatment is not maintained, the hair on the top of the head and on both temporal areas will gradually become thinner and fall out with age, and although the hair transplanted over will keep growing normally, we can imagine that this hair will not be enough to have sufficient coverage. It’s not like some cosmetic agencies claim that “hair transplantation is a one-step process and you’ll never have to worry about it”. Therefore, if you decide to have a hair transplant, you should also be determined to take long-term medication or topical medication. Hair transplantation is also possible for some patients with baldness, provided that the patient has only a limited patch of hair loss and the localized hair has not grown out for more than 2 years and the baldness has not recurred. However, I do not highly recommend it. This is because most people with baldness can have recurring episodes, and even hair that is viable after transplantation can still fall out at the onset. In addition to the type of disease, the factor that determines whether or not a hair transplant is possible is the amount of donor, that is, the number of existing hair follicles. If the area of hair loss is large and the number of existing hair follicles is not sufficient, then buying a good quality wig set would be the best option. Therefore, hair transplantation is not a cure-all for alopecia areata. As a patient, you should visit the dermatology department of a regular hospital, especially one that is capable of performing hair transplantation, for detailed diagnosis and consultation, and choose the most suitable treatment plan for you under the guidance of a professional doctor.