Background: Managing patients with acne scars remains an important challenge, as scarring negatively affects psychosocial wellbeing. Hyaluronic acid (HA) cross-linked fillers have demonstrated good efficacy and tolerability for the correction of acne scars but are limited by their reduced biological activity and low concentrations.
Objective: This study investigated the efficacy and safety on scars of a high-concentration (4.5%) HA-based filler with hybrid cooperative complexes (HCC) of high-molecular-weight and low-molecular-weight HA.
Methods: Participants received treatment twice; the first was provided at baseline (T0) and the second after 4 weeks (T1). Data were collected at T1 and after 4 months (T2) by photographs and instrumental evaluation of the skin.
Results: The study population included 28 patients. Improvements in the mean Goodman and Baron grade were significant across time points T0 and T1 (12% improvement; p = .0002) and T0 and T2 (31% improvement; p < .0001). Instrumental evaluation of the skin surface demonstrated a 20% reduction in the average deepness of acne scars after 4 months (p < .0001). No serious adverse events were reported during the study procedure.
Conclusion: Highly concentrated (4.5%) HCC appears to be an effective option for the correction of facial acne scars.
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