Poly-L-Lactic Acid: A Comparative Study of Injectable and Thread-Based Delivery in Atrophic Acne Scars
Background: Management of atrophic acne scars remains challenging due to their heterogeneous morphology and suboptimal response to conventional therapies. Poly-L-lactic acid (PLLA), a biostimulatory agent, promotes neocollagenesis and has emerged as a promising therapeutic option. However, comparative data on different delivery modalities of PLLA and their effects on dermal remodeling and skin physiology remain limited.
Objective: To compare two delivery modalities of PLLA (injectable versus mono-thread) and evaluate their effects on dermal remodeling, clinical outcomes, and safety in atrophic acne scars.
Methods: This prospective split-face study included 24 patients with atrophic acne scars. The right facial side was treated with a single session of PLLA mono-threads, while the left side received two sessions of injectable PLLA at 6-week intervals. Clinical outcomes were assessed using Goodman and Baron's qualitative and quantitative grading systems over a 3-month follow-up period.
• included adult patients (≥18 years) of both sexes presenting with clinically diagnosed atrophic acne scars (Grades 2-4 according to the Goodman and Baron classification)