What Are Dermal Fillers?
March 1, 2026
If you have started noticing wrinkles and a face that looks a little flatter than it used to, you are not imagining it. Dermal fillers are one of the ways people add that lost volume and fullness back.
Here is what is happening underneath. As we age, the face slowly loses the layer of fat that sits between the muscles and the skin. Once that cushion thins out, the muscles sit closer to the surface. The skin itself also loses some of the proteins that keep it plump.
That is when lines like crow's feet and smile lines start to show up. The skin stretches a little more over time too, so the face reads as flatter and less full.
Plenty of other things speed this along, like sun exposure, your lifestyle, and the genes you were born with.
Simulated demonstration of hyaluronic acid dermal filler restoring midface volume. Cheeks lifted, tear troughs filled, lips subtly plumped, nasolabial folds softened — skin texture and identity unchanged.
What are dermal fillers?
Dermal fillers are one of the most popular ways to treat wrinkles, fine lines, and lost contour. They are injectable gels, and getting them put in is minimally invasive.
They are common, too. According to The American Board of Cosmetic Surgery, more than 1 million people in the United States get filler treatments every year (1).
Filler does not actually replace the fat and proteins your skin has lost. Instead it mimics the structure that used to be there, so the face reads as fuller again.
It also works differently from Botox. Where Botox relaxes the facial muscles to soften wrinkles, filler adds volume underneath, and that is where the plumped-up look comes from.
Types of dermal fillers
There is no single dermal filler. Each type is made from a different material and behaves a little differently once it is in the skin.
Hyaluronic acid
Your skin already makes hyaluronic acid on its own, which is why so many skincare products use it to hydrate and plump. As a filler it goes in as a soft gel.
It tends to last longer than other fillers, though the effect is not permanent. You can usually expect 6 to 12 months, and it costs more than most other options (2, 3).
Calcium hydroxylapatite
Calcium hydroxylapatite is a mineral-like compound found naturally in your bones. As a filler it goes in soft and gel-like, and since nothing in it comes from animals, vegans can use it.
It is also one of the longer-lasting fillers, with results that usually hold for 9 to 15 months (4, 5, 6).
Collagen stimulator
Poly-L-lactic acid takes a day or two to start working. Instead of just sitting under the skin like other fillers, it prompts your body to make its own collagen, especially in the face.
It is synthetic but biodegradable. In fact, it is the same material used in dissolvable stitches to help wounds heal after surgery (7, 8).
Polymethyl-methacrylate (PMMA) microspheres
PMMA microspheres are tiny synthetic balls that get injected under wrinkles and fine lines to rebuild structure. They work well for deep wrinkles and for thin lips that need filling out.
Because they last longer than poly-L-lactic acid and hyaluronic acid fillers, they take more time and more appointments. The doctor fills each area slowly, using several smaller injections (9, 10, 11).
Autologous fat injections (facial fat grafting)
This filler comes from your own body. Autologous fat injections use fat taken from somewhere like the abdomen or buttocks.
A liposuction procedure pulls the fat, which then gets injected into an area that needs more volume. Unlike the other fillers, this one is natural and can last permanently, because it actually restores the fat and proteins the skin has lost (12, 13, 14, 15).
Hyaluronic acid (HA) fillers — the most common — last 6-24 months depending on placement and product family. Biostimulator fillers like PLLA and PMMA last years but cost more and can't be reversed.
Where can dermal filler be used?
The right filler depends on the area you want to treat. Here is how that usually breaks down.
Deep wrinkles
Almost any filler can soften deep wrinkles. That said, most plastic surgeons reach for certain hyaluronic acids, PMMA, or poly-L-lactic acid.
Under-eye area
Certain hyaluronic acids, autologous fat injections, and poly-L-lactic acid can be used around and under the eyes. This is an area where the surgeon really matters, because the results are not always what you hoped for and some procedures leave the under-eye looking bumpy.
Your doctor may also steer you away from filler here entirely. The Food and Drug Administration (FDA) has not approved any dermal filler for use around the eyes.
Nasolabial or smile lines
PMMA and nearly every type of hyaluronic acid are FDA-approved for smile lines and the folds around the nose.
Forehead and crow's feet wrinkles
Poly-L-lactic acid, calcium hydroxylapatite, and PMMA are sometimes used on the forehead and crow's feet. Most doctors advise against injecting this area, though, since it can lead to serious complications. It is not FDA-approved here either.
Cheeks
Poly-L-lactic acid and some hyaluronic acid fillers can plump and reshape the cheeks.
Lips
Most hyaluronic acid fillers are FDA-approved for the lips. Other fillers should be avoided here to prevent complications.
Chin
Any filler can add volume and contour to the chin, but calcium hydroxylapatite and hyaluronic acid are the usual recommendations.
Chest or décolletage
Wrinkles on the chest and lower neck can be softened with hyaluronic acid fillers.
A simplified path from the volume-loss concern through severity grade to the modality the evidence supports. HA is first-line for most concerns; biostimulators win on longevity for cheek and jawline work; surgery overtakes filler when laxity dominates.
The benefits of dermal fillers
Filler is popular for a reason. The upside goes beyond the way you look, and here is what people tend to notice.
Immediate and visible results
Unlike more invasive procedures, filler starts working the moment it goes in. Over a few days it settles under the skin, adds volume, and smooths the lines out.
Does not require recovery time
How long you take to bounce back depends on how many injections you get in one sitting, but the procedure itself rarely takes more than 10 to 15 minutes.
There is no surgery involved, so you do not need real recovery time. You might see a little swelling, but that fades once the filler settles in.
Minimal risk
The common risks are mild, like redness and swelling at the injection sites, and they clear up within a few days.
The bigger worry is asymmetry, where one side of the face ends up looking different from the other. You can lower that risk a lot by choosing a skilled, experienced surgeon to do the injections.
Confidence boost
Most people see a real difference afterward. The skin looks smoother and the contours sharper, and people often describe their face as younger, with fewer wrinkles and clearer bone structure.
So if your signs of aging are becoming harder to ignore, filler might be worth looking into.
The side effects of dermal fillers
The common side effects of filler are minimal and manageable (16). The ones most people report are:
- Redness.
- Swelling at the injection site.
- Bruising.
- Itching.
- Mild pain after treatment.
Some people, especially with certain hyaluronic acids and autologous fat injections, run into rarer side effects, including:
- Filler migration, which refers to the existence of the filler material in a different area of the face other than the injection site.
- Visible clumping caused by the filler material.
- Mild to severe headaches.
- Vision problems including blurred vision and even blindness in severe cases.
- Allergic reaction.
- Infections.
- Skin discoloration.
How to minimize the risks of dermal fillers
A few simple steps go a long way toward keeping the side effects to a minimum (17).
- Find a licensed, trusted healthcare provider who is highly recommended for dermal fillers.
- Never purchase dermal filler materials online or try to inject them yourself.
- Follow your doctor's instructions typically before and after getting a dermal filler treatment.
- You should avoid drinking alcohol the day before getting the treatment and 2 days after.
- Ask your doctor about all the questions you have.
- Silicone injections, butt fillers, and fillers for spaces are not approved by the FDA and are not safe to use for the face.
- Use aloe vera or arnica gel if there is swelling and try to avoid excessive touching of the injection site to avoid introducing bacteria and subsequent infections.
- Call your doctor immediately if the side effects are severe or last longer than expected.
FAQ about dermal fillers
Who should avoid dermal fillers?
Pregnant and breastfeeding women should skip filler, since there is no research showing it is safe for them. You should also avoid getting filler around a teeth cleaning or any dental work, because those procedures put a lot of pressure and stretching on the face, which can shift the filler out of place.
During your consultation, ask your doctor when it is safe to have a dental procedure again.
How do I know the best dermal filler for me?
Every face is different, and a good doctor is the one who builds the right plan for your case and knows how to keep the results looking natural.
Getting a natural look sometimes means using more than one type of filler. Each category has several brands, and an experienced doctor knows which brand fits which job.
Restylane is a good example. It is one of the most popular hyaluronic acid fillers and comes in several lines, each with its own purpose and concentration. Restylane Lyft has larger particles and can rebuild cheekbones, while Restylane Silk is better for softening fine lines and plumping lips.
If there is one thing to take away, it is this. Choose a good doctor who knows how to make your face look younger again, and the rest tends to follow.