There are a number of ways to repair donor site scars- procedures I perform on a regular basis given the percentage of my practice devoted to reparative work.
Scars can be excised then closed using a variety of plastic surgery techniques, including sometimes the trichophytic (what I call the HITS) technique so hairs grow through it. When there is tremendous tension, tissue expansion can help with closure. Another common technique involves the planting of grafts actually into the scar- and many of these grafts can be obtained by the incisionless FUE technique, avoiding another scar. Sometiems when portions of the donor site scar are quite wide, the wider portions can be excised and the hairs obtained in the narrow scar excision can be then dissected out then planted into the narrower portions of the scar to reduce its visibility.
Best of luck.
Jeffrey Epstein, MD, FACS