There are several types of fillers used for acne scarring, each with its own characteristics and advantages. Here are some common types and their differences:1. Hyaluronic Acid Fillers (HA):• Examples: Juvederm, Restylane, Belotero• HA fillers are temporary and typically last around 6-12 months.• They are well-tolerated and reversible using hyaluronidase.• Suitable for filling shallow to moderate acne scars.2. Calcium Hydroxylapatite Fillers (CaHA):• Example: Radiesse• CaHA fillers are semi-permanent and can last up to 12-18 months.• They stimulate collagen production, providing longer-lasting results.• More suitable for deeper acne scars and volume restoration.3. Poly-L-lactic Acid Fillers (PLLA):• Example: Sculptra• PLLA fillers stimulate collagen production over time, offering gradual and natural-looking results.• They can last up to 2 years or more.• Often used for broad areas of volume loss or deep scarring.4. Polymethylmethacrylate (PMMA) Microspheres Fillers:• Example: Bellafill• PMMA fillers provide permanent results as they are not absorbed by the body.• They contain tiny spheres that remain in place and stimulate collagen production.• Typically used for deeper, atrophic acne scars.5. Autologous Fat Transfer:• Fat is harvested from the patient's own body, usually from areas like the abdomen or thighs, and injected into acne scars.• Results can be long-lasting, but some of the fat may be reabsorbed by the body over time.• Requires a minor surgical procedure for fat harvesting.When choosing a filler for acne scarring, factors such as the type and severity of scarring, the patient's skin type and concerns, as well as the duration of desired results, should all be taken into consideration. Consulting with a skilled injector is essential to determine the most suitable filler and treatment plan for individual needs.