Congenital sparse eyebrows or eyebrow defects caused by scarring can be corrected through single follicular unit transplantation. Autologous hair transplantation involves using microsurgical techniques to extract healthy follicular units from the occipital region. After meticulous separation, these units are transplanted to the recipient site. Once the follicles survive, they grow healthy new hair that retains all the biological characteristics of the original hair and does not undergo necrosis again.
Typically, eyebrow transplantation requires only 200-300 single follicular units. During implantation, the direction and angle of placement are determined based on the natural texture of the eyebrows. The final shape is designed according to the patient's preferences. Since donor hair differs significantly from eyebrow hair, meticulous selection of donor follicles under a microscope is crucial for successful transplantation.
Hair transplantation is typically performed under local anesthesia with minimal discomfort, though the procedure itself is lengthy—usually around three hours. This duration stems from the time-consuming process of separating hair into individual follicles or minute grafts.
Like other skin areas, the scalp possesses elasticity. A strip no wider than 2cm can be harvested and directly sutured closed.Microscopically, the average spacing between hairs in the donor area may slightly increase. Visually, however, no noticeable difference is apparent. Once hair grows out, it naturally covers the area, leaving no visible impact on appearance. Similarly, after sufficient time, hair can be harvested repeatedly—a second, third, or even fourth or fifth time.
Hair constantly cycles through different growth phases, maintaining a dynamic equilibrium between shedding and regrowth. On average, about 100 hairs shed daily, while an equal number enter the growth phase. New eyebrow hair begins growing three months post-surgery, with initial results visible after six months. Due to hair's unique growth pattern, transplanted eyebrows require periodic trimming to prevent overgrowth and maintain aesthetics.