A prospective, randomized, split-scar, within-participant controlled clinical study evaluating the efficacy and safety of a single session of autologous nanofat injection followed by topical silicone gel in the treatment of atrophic postburn or posttraumatic scars. Each participant will have two comparable scar areas/sites. One site will receive autologous nanofat injection followed by topical silicone gel, while the contralateral/comparable control site will receive topical silicone gel alone. Participants will be followed for 3 months, with assessments at baseline, 1 month, and 3 months.