Which of the following is not considered a type of dermal filler?

Poly-L-lactic acid is actually a type of dermal filler. It is a synthetic substance that is biocompatible and biodegradable, often used to stimulate collagen production in the skin over time, which provides a gradual increase in volume and enhances facial contouring.

The other options listed—calcium-based fillers, synthetic fillers, and hyaluronic acid—are all recognized categories of dermal fillers. Calcium-based fillers, such as those containing calcium hydroxyapatite, provide structure and stimulate collagen production. Synthetic fillers encompass various materials designed for cosmetic enhancement, while hyaluronic acid fillers are among the most popular due to their ability to attract moisture, providing hydration and volume in a minimally invasive manner. Understanding these categories is essential when considering the various applications and effects of dermal fillers in esthetics.