Hair donor area for hair transplantation There are many sources of hair for transplantation, scalp, eyebrows, eyelashes, nose hair and even body hair can be used for transplantation. After many years of clinical practice, it is found that the “U”-shaped hair area behind the ear and above and below the occipital bulge is in the dominant growth cycle in a person’s life, and occipital hair is not subject to the regulation of androgens, and will not fall off in general. For male pattern baldness patients, even if the occipital hair is transplanted to other areas of the scalp that are regulated by androgens, it will not fall out. In addition, occipital hair or hair behind the ear can still maintain its original hair properties and growth cycle after transplantation to other parts of the scalp. Because of the “donor-area advantage” of hair in this area, it is widely used in clinical practice.