Formation of scars after surgical incisions requires the proper appositions of elements contributing to the scarring process. The structural rebuilding of damaged tissues is essential in producing a linear scar. The excess of blood, foreign particles, exuberant sutures, necrotic tissue, possible infective agents, as well as the ongoing inflammatory process may produce a non-linear, sometimes painful keloidal scar. Centella asiatica (CA) extracts have been used topically since ancient times for preventing keloids (i.e. after extensive burns) and for other applications including ulcer healing. The aim of this registry study was to evaluate the effect of supplementation with Centellicum® (Horphag Research Ltd.) on the healing of surgical wounds in subjects with previous hypertrophic or keloid scars, and to identify with ultrasound the collagen components of the scar in order to assess the quality (or linearity) of surgical wounds. Subjects with history of hypertrophic scars or keloid following previous surgery were included in this registry. Short term antibiotic prophylaxis was used as per surgical standards with cephalosporins for three days maximum after surgery. Only patients receiving abdominal or knee surgery were included. A total of 129 patients were included: 64 in the control group treated only with standard management, and 65 in the active treatment group where CA supplementation with Centellicum® was used at the dose of two 225 mg capsules/day from the 2nd to 6th week after surgery. A total of 64 scars were analyzed within the control group and 65 in the supplement group. The tolerability to Centellicum® was overall good, and no side effects were reported. Compliance to treatment was optimal, with >98% of the CA capsules correctly used. The ultrasound-assessed scar tissue regularity was on average lower in controls than in supplemented subjects (P<0.05). Scars also appeared to be significantly more homogeneous in CA patients than in controls. Supplementation with Centellicum® is safe and does not interfere with other concomitant treatments. It is well tolerated and compliance to treatment is optimal.