Hair transplantation is a surgical method of treating alopecia in which hair from the back of the head is surgically removed and separated and transplanted to the bald area at the front of the head. At this time, the part of the back of the head that is used, that is, the donor area, is called the permanent area. This permanent area has the property of being donor-dominant and does not lose its original properties even if it is transferred to any other body part. Therefore, hair transplantation is a hair redistribution operation that uses the donor area's superiority to hide areas where hair is thinning or has completely lost hair, and can be said to be a semi-permanent and most effective hair loss treatment.