The mechanism of action of injectable PLLA involves the degradation of the microsphere particles, in which a tissue inflammatory response is initiated and a fibrous capsule surrounds the polylactides.
Over time, the product degrades, the inflammatory response decreases and the resulting collagen deposition increases. This dermal fibroplasia produces the desired result and increases dermal thickness.
CUNHA, M. G, PARAVI, F.D., MACHADO, C.A. Histological changes of collagen types after different modalities of dermal remodeling treatment: A literature review. Surg Cosmet Dermatol. 2015; 7(4): 285-92. FITZGERALD, R. et al. Physiochemical Characteristics of Poly-L-Lactic Acid (PLLA). Aesthetic Surgery Journal 2018, Vol 38. ORTOLAN, M. C. A. B. et al. Influence of aging on the skin quality of white-skinned women: the role of collagen, elastic material density, and vascularization. Rev Bras Cir Plást. 2013;28(1):41-8