PLLA (Poly-L-Lactic Acid) is a biodegradable substance used in aesthetic treatments to stimulate collagen production and restore facial volume. Often used in non-surgical facelifts and wrinkle treatments, PLLA works by gradually revitalizing the skin from within, improving its elasticity and firmness. It is commonly used to treat areas like the cheeks, temples, and jawline, providing natural-looking results. Over time, PLLA helps restore a youthful appearance by enhancing skin texture and reducing signs of aging, making it a popular choice in Korean aesthetics for long-lasting skin rejuvenation.