Dermal Fillers Explained: Types, How Long They Last, and What to Expect

What Are Dermal Fillers?

Dermal fillers are FDA-approved injectable substances that add volume under the skin, smooth deep lines, and enhance features like cheeks, lips, and the jawline. Unlike Botox, which relaxes muscles to reduce expression lines, fillers physically fill in areas where volume has been lost or where more definition is desired.

There are four main types approved by the FDA:

• Hyaluronic acid (HA) fillers — the most common
• Calcium hydroxylapatite (CaHA) fillers
• Poly-L-lactic acid (PLLA) fillers
• Polymethylmethacrylate (PMMA) fillers — permanent, rarely used today

How Each Type Works

Hyaluronic acid (HA) fillers (brand names: Juvéderm, Restylane, Belotero): HA is a substance your body naturally produces to keep skin hydrated. These fillers restore volume and attract water to the treated area, plumping skin from within. They are fully reversible using an enzyme called hyaluronidase. Results last 6–18 months depending on the specific product and where it is injected.

Calcium hydroxylapatite (CaHA) fillers (brand name: Radiesse): These contain tiny mineral particles suspended in a gel. The gel provides immediate volume, and over 3–6 months your body uses the particles as a scaffold to build new collagen (the protein that gives skin its firmness). Results last 12–18+ months. Unlike HA fillers, CaHA is not reversible with an enzyme.

Poly-L-lactic acid (PLLA) fillers (brand name: Sculptra): PLLA is a biodegradable synthetic material similar to dissolving sutures. It does not add immediate volume — instead, it triggers your skin to produce its own collagen over 4–8 weeks. Results develop gradually over 3–6 months and can last 18–24+ months. Multiple sessions (usually 3–5 spaced 4–6 weeks apart) are required.

PMMA fillers (brand name: Bellafill): These are permanent microspheres that stay in the skin indefinitely. While they offer lasting results, complications like granulomas (small inflammatory nodules) occur in 5–10% of patients and removal requires surgery. Most dermatologists reserve these for select cases only.

What to Expect During Treatment

Your appointment will typically follow these steps:

• Consultation: Your dermatologist reviews your goals, examines your face, and recommends specific products and amounts
• Photographs: Before photos are taken for comparison
• Preparation: The treatment area is cleaned; a topical numbing cream may be applied. Many fillers now contain lidocaine (a local anesthetic) to reduce discomfort during injection
• Injection: A fine needle or blunt-tip cannula (a thin flexible tube that reduces bruising) is used to place the filler at the correct depth under the skin
• Review: Your provider reviews symmetry and volume with you before you leave

Most appointments take 30–60 minutes. You can return to most normal activities the same day.

Results and Recovery

Recovery is generally mild. Here is what to expect:

• Swelling and bruising: Affect 10–50% of patients; usually resolve within 7–14 days
• Redness and tenderness: Common for the first few days
• Final results: Best assessed at 1–2 weeks after swelling subsides

For HA fillers, you will see results immediately. For CaHA, gradual improvement continues for up to 6 months as new collagen forms. For PLLA (Sculptra), visible improvement typically begins 4–8 weeks after your first session and builds over several months.

Benefits and Risks

Benefits:

• Non-surgical with minimal downtime
• Results visible quickly with most filler types
• HA fillers are fully reversible if you are unhappy with results
• Can be combined with Botox for more complete facial rejuvenation

Risks and side effects:

• Common (resolve on their own): bruising, swelling, redness, tenderness
• Less common: lumps or nodules under the skin (1–10% depending on filler type), product migration
• Rare but serious: vascular occlusion (filler injected into or near a blood vessel, blocking blood flow) occurs in less than 0.1% of treatments but requires immediate medical attention; granulomas (inflammatory reactions) occur in 1–5% with PLLA and 5–10% with PMMA

Who Is a Good Candidate?

You may be a good candidate for dermal fillers if you:

• Want to restore volume lost to aging without surgery
• Have moderate-to-deep facial folds or wrinkles
• Want to enhance facial features like lips, cheeks, or the jawline
• Are in good overall health and have realistic expectations
• Are not pregnant or breastfeeding

Fillers may not be the best option if you have active skin infections, certain autoimmune conditions, or allergies to filler components. Your dermatologist will review your health history during the consultation.

When to See a Dermatologist

Schedule a consultation with a board-certified dermatologist if you are considering fillers for the first time, want to know which filler type suits your goals and budget, or are interested in combining fillers with other treatments. Seek care promptly if you develop any of the following after treatment: severe pain, skin that turns white or bluish near the injection site, vision changes, or signs of infection (increasing redness, warmth, or pus). These can indicate rare but serious complications requiring urgent treatment.

Frequently Asked Questions

Q: Will my skin sag more if I stop getting fillers?
A: No. When fillers dissolve, your skin returns to its pre-treatment baseline — it does not sag worse than before. Some collagen-stimulating fillers like Sculptra and Radiesse may even leave behind some long-term skin improvement after the filler itself is gone.

Q: Can I mix different fillers in the same area?
A: Generally no. Different fillers have different textures, particle sizes, and breakdown rates. Mixing them in the same spot creates unpredictable results. Your provider will use one filler per treatment area. Using different fillers in different areas (for example, Sculptra for overall volume and HA for the lips) is perfectly fine and common.

Q: How much do fillers cost?
A: Cost depends on the filler type and how much you need. HA fillers typically run $600–$900 per syringe. Radiesse runs $700–$900 per syringe. Sculptra sessions typically cost $800–$1,200 per vial, with 3–5 sessions needed. Over 10 years, HA maintenance adds up to more than PLLA or CaHA, which require less frequent retreatment.

Q: How do I know which filler is right for me?
A: It depends on the area being treated, how long you want results to last, your budget, and how comfortable you are with maintenance appointments. Your dermatologist will assess your anatomy, listen to your goals, and recommend a specific product and plan tailored to you.