Procedure

Dermal Fillers

A gel injected under the skin to replace volume that has been lost, or to add shape. Most are hyaluronic acid and last six months to two years. They do not treat movement lines, loose skin, or skin quality.
Dr. Schwarz, MD · Board-certified dermatologistLast reviewed September 8, 2026
Gloved hands steadying a reclining woman's face while a fine syringe is placed near her cheekbone

Start here

Filler replaces volume. That is the whole job — it is not a wrinkle treatment and not a skin treatment, and most of the disappointment I see comes from someone being sold it for a problem it cannot solve. Start with less than you think, and judge the result at two weeks rather than in the chair. The risk patients almost never hear about beforehand is vascular occlusion, meaning filler blocking a blood vessel, which is why any injector should be able to tell you without hesitating that they keep hyaluronidase in the building and exactly what they would do if your skin turned white on a Saturday night.

— Dr. Schwarz, Board Certified Dermatologist

Key Facts

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Also calledHA filler, hyaluronic acid filler, injectables, volumizers. Hyaluronic acid brands include Juvederm, Restylane, RHA and Belotero. Radiesse, Sculptra and Bellafill are different materials
Downtime1 to 3 days of swelling, and bruising for up to a week. Lips swell considerably more than anywhere else
SessionsUsually one, sometimes a review and top-up at 2 to 4 weeks, then repeated when it fades
Typical costAbout $600 to $1,200 per syringe in the US. Many areas need more than one syringe, so a plan is priced in syringes, not visits
Results timelineVisible immediately, honest at 2 weeks once swelling settles
PainPressure and pinching. Numbing cream is standard and most fillers contain local anesthetic
Skin tone safetyNo pigment risk from the filler itself. Needle marks and bruising can leave temporary dark spots on deeper skin tones
ReversibleHyaluronic acid fillers can be dissolved with an enzyme called hyaluronidase. Calcium hydroxylapatite, poly-L-lactic acid and permanent fillers cannot

What It Is

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A dermal filler is a gel injected under the skin to take up space. Most are hyaluronic acid, a sugar the body already makes, cross-linked so it lasts months rather than days. It goes in through a fine needle or a blunt-tipped tube called a cannula, in small amounts, and is shaped by hand. The material matters more than the brand. Hyaluronic acid is the most common and the only kind that can be dissolved on demand. Calcium hydroxylapatite is a thicker, mineral-based gel used for structure. Poly-L-lactic acid is a collagen stimulator that builds over months, not really a filler. Permanent fillers made of plastic beads are rarely a good first choice, because a poor result is permanent too. Common areas are the cheeks, temples, under-eye hollows, lips, chin, jawline, nose-to-mouth folds and the backs of the hands. The nose and between the brows carry a higher risk of blocking a blood vessel than anywhere else.

How It Works

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Hyaluronic acid holds many times its weight in water. Injected as a cross-linked gel it takes up space under the skin and draws water in, so a hollow becomes less hollow and a fold is supported from underneath. The effect is mechanical and immediate.

A firm gel resists pressure and goes deep, on bone, to rebuild structure at the cheekbone, chin or jaw. A soft, spreadable gel goes near the surface, in lips or fine lines, where a stiff gel would look and feel like a lump. Wrong stiffness in the wrong layer is a common cause of a result that looks off without anyone saying why.

Stretching the tissue may also nudge collagen-making cells into producing more, so a little of the effect outlasts the gel. That is modest and not a reason to have it. Poly-L-lactic acid works almost entirely this way — low-grade inflammation that builds collagen over three to six months, which is why nothing much shows on the day.

None of this tightens skin or relaxes a muscle. A line made by frowning stays, because the muscle is still frowning.

Skin is about two millimetres thick on the face. How deep a treatment reaches decides what it can change, and whether it treats all of the skin or scattered columns of it decides how long you take to heal.

How it works
Compare
Skin basics
EPIDERMISDERMISFAT0.05 mm — pigment0.5 mm — texture + pores1.0 mm — collagen1.5 mm — deep dermisPEELNEEDLINGNON-ABLATIVE LASERABLATIVE LASERGOES BELOW THE SKIN

This works below the skin altogether, in the fat or the muscle beneath it. Nothing applied to the surface reaches here, which is the whole reason the procedure exists — and why it is done by injection, by needle or with a blade rather than with a cream.

A peel or a scrub takes the skin off evenly from the surface down. Everything above the line goes and nothing below it is touched, which is why peels suit surface pigment and rough texture, and why the whole face flakes for a few days after.

Needles make hundreds of separate channels and leave the skin between them untouched. That untouched skin is what heals the rest, so recovery is quick — but a needle only injures the skin to start repair. It removes nothing.

The light passes through the surface and heats a column underneath it. The surface stays whole, so you leave red rather than raw — and it takes a course of sessions rather than one.

The laser removes columns of skin outright: the white gaps here are tissue that is gone, and new skin grows in from the sides. The strongest of the four, and the longest to heal.

The outer layer, and the only one anything in a jar reaches. It renews itself constantly: a cell made at the bottom takes about a month to reach the surface and flake off. Most of what a skincare product does, it does here.

The living layer underneath, holding the blood vessels, the nerves and the collagen. It is where lasting change happens and it is hard to reach: most of what is sold for the skin never gets this far.

What It Treats

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Wrinkles and Fine Lines
Wrinkles and Fine Lines
Strong evidence
Hyaluronic acid gel that replaces volume that has been lost, so it suits folds and hollows — the lines from the nose to the mouth, flattened cheeks, under-eye hollowing. It is the wrong tool for surface lines. Results last roughly six to eighteen months, and the gel can be dissolved if the result is not right.
Dark Circles Under the Eyes
Dark Circles Under the Eyes
Moderate evidence
A small amount of hyaluronic acid placed deep in the tear trough is the only thing that genuinely fills a hollow, and when the shadow is the problem the difference can be striking. It lasts months to a couple of years and then needs repeating, and it does nothing for brown pigment. It is one of the most technically demanding places on the face to inject, so who does it matters more than what they use.
Close-up of the cheek, nose and mouth of an adult with light skin, turned three-quarters away from the camera against a pale blue background. The surface of the cheek is uneven, dimpled with shallow depressions and small pits that catch the light. There are no active spots — the change here is in the texture of the skin rather than its color.
Acne Scarring
Moderate evidence
Filler placed under a shallow rolling or boxcar scar lifts the floor of it straight away, which makes it the only option here with a same-day result. It is temporary, lasting months to a couple of years depending on the product. It works best as a top-up alongside collagen-building treatment, not instead of it.

Pros and Cons

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Pros
  • Immediate You see the change on the table and can adjust.
  • Reversible, if it is hyaluronic acid An enzyme dissolves it within days.
  • It rebuilds structure Cheek, chin and jaw support no cream or laser gives.
  • Short recovery Presentable the next day, apart from lips.
Cons
  • Easy to overdo Small amounts add up, and overfilling shows in photos.
  • The serious risk is real Filler can block a blood vessel — an emergency.
  • Duration is unpredictable Some outlasts the stated duration by years.
  • Expensive to maintain Several syringes a year, at full price, indefinitely.
  • Delayed reactions happen Firm, tender swelling weeks or months later.

How to Prepare

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2 weeks before3 to 5 days before24 hours before
Events, dental work, shots
2 weeks before
Book two weeks before anything that matters. Bruising fades in a week, swelling in two. Most providers also leave two weeks around dental work and shots.
Bruising
3 to 5 days before
Stop fish oil, vitamin E and ibuprofen-type painkillers for three to five days if you can. Never stop a prescribed blood thinner on your own.
Alcohol and food
24 hours before
No alcohol for 24 hours. Arrive hydrated and fed — fainting is more likely on an empty stomach.
What to bring
Photos of yourself from earlier years. Talk about what you want to look like, not which product. Ask what will be used, how much, and the plan if you do not like it.

What Happens

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ArrivingThe treatmentLeaving
Arriving
You are assessed sitting upright, because faces look different lying down. Photos are taken, areas marked, and the injector should say which product, how many syringes and why. Risks including vascular occlusion are said out loud and consent signed. Numbing cream for 20 to 30 minutes is usual, most fillers contain lidocaine, and lips may get a dental block. Your provider will ask about these things.
The treatment
The skin is cleaned. Filler goes in in small amounts through a fine needle or a blunt cannula threaded from one entry point. The injector pauses to mold it and sits you up to check symmetry. It takes 15 to 45 minutes. Expect pressure and pinching, not sharp pain. Lips hurt most; a cannula hurts less than needle passes.
Leaving
Pinpoint red marks, some swelling, maybe a bruise starting. You will look fuller than the final result, especially the lips, and some lumpiness on day one is normal.

Recovery

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First 4 daysDay 5 to 14Week 2
First 4 days
Puffiness and tenderness build through the first day; ice in short spells helps. Lips can swell dramatically overnight. Days 2 to 4 are the most swollen and bruised, with firm patches and small lumps. People panic here, and it is almost always just swelling.
Day 5 to 14
Swelling drops, bruises turn yellow and fade, and lumps soften. Most people look normal to others within a week.
Week 2
What you see now is what you paid for. Review it, ask for an adjustment, or add a small amount if the area is under-filled.

Aftercare

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24 hours2 nights2 weeks
Makeup and exercise
24 hours
Makeup the next day — over fresh needle points the same day risks infection. Skip heavy exercise for 24 hours; it increases swelling and bruising.
Sleeping
2 nights
On your back, slightly propped, for the first two nights.
Heat and dental work
2 weeks
No saunas, hot yoga or sunbeds, and about 2 weeks either side of cleanings and dental procedures.
Ice
Short spells for the first day.
Touching
Do not massage or press the area unless you were told to. If you were shown how, do exactly that.
Warning signs
Swelling and bruising are expected. Pain that grows rather than settles, skin turning white or blotchy blue, or any vision change is not. Call immediately, day or night.

Risks

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Most of what happens after filler is swelling and bruising, and it settles on its own. The risk that matters is uncommon and serious, so know the signs beforehand. Filler can enter or press on a blood vessel and cut off the blood supply to an area of skin — vascular occlusion. If the vessel connects to those supplying the eye, it can cause permanent loss of vision, rare but reported. Highest-risk areas are between the brows, the nose, the fold beside the nose, the forehead and under the eyes. Treatment is a large dose of hyaluronidase, the enzyme that dissolves hyaluronic acid, as soon as possible — results are far better within hours than within days. Ask before you book whether the clinic keeps hyaluronidase on site, and expect an injector to know the dose and their plan without looking it up.

A lump or firm area
Common in the first two weeks and usually just swelling. Still there at three to four weeks, it needs looking at — it may be gel needing massage or a small dose of dissolver.
A bluish tint under thin skin
The Tyndall effect, from gel too close to the surface, most often under the eyes. It does not fade on its own. Dissolving corrects it.
Swelling weeks or months later
Delayed nodules can appear long after the appointment, sometimes triggered by an infection, a dental procedure or a vaccination. Uncommon and usually treatable, but they need assessing.
Under-eye puffiness that lingers
Hyaluronic acid holds water, and under-eye filler can leave a permanent-looking puffiness. Dissolving treats it.
Asymmetry
Review at two weeks. Small differences are often correctable with a little more on one side.
A cold sore outbreak after lip filler
Antiviral treatment works best started early.

In Deeper Skin Tones

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Filler itself carries no extra pigment risk. It does not injure, burn or peel skin, so it does not cause the pigment changes lasers and stronger peels can. Its risk is about blood vessels, and that is the same in every skin tone.

What differs is what happens after the needle. Bruises and needle points can leave post-inflammatory hyperpigmentation, a flat dark mark left once the skin has healed, and it is more common and longer-lasting on deeper skin tones. It fades, but it can take months. Ask for a blunt cannula rather than repeated needle entries, ice before and after, no alcohol or anti-inflammatory painkillers beforehand if your doctor agrees, and daily sunscreen until any mark has gone. Keloid scars from filler are very rare, but if you scar that way, say so first.

Under-eye filler needs a specific note. Dark circles have several causes, and in deeper skin tones pigment in the skin itself is a common one. Filler only corrects a shadow cast by a hollow. If the darkness is pigment, filler will not lift it, and can make the area look puffy without looking brighter. Ask before agreeing to that syringe.

If You Stop

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Hyaluronic acid filler is broken down by the body, so if you stop, the volume fades over months and the area returns to roughly how it would have looked untreated. No crash, no rebound, nothing to taper.

The common worry is that filler stretches the skin, so stopping leaves you looser than before. There is no good evidence that ordinary amounts do this. It is more open for very large volumes repeated over many years, and the evidence is limited either way.

Imaging studies have found filler still present years after injection, well beyond the durations quoted in marketing. Not harmful in itself, but "it will all be gone in a year" is not reliably true, and it is a reason to keep a record of what was placed where. If you want it gone rather than fading, it can be dissolved deliberately.

Combining Treatments

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Same day
Botulinum toxin
The standard pairing, routine at one visit, toxin first.
Same day
Home skincare
Retinoids, acids and sunscreen carry on as normal.
Wait 2 weeks
Lasers and energy devices
About 2 weeks either side, since heat can move fresh gel.
Wait 2 weeks
Facial massage
Also about 2 weeks either side; pressure moves fresh gel.
Different visit
Peels and microneedling
These work well with filler over a year, spaced apart rather than on one day.
Wait 2 weeks
Dental work or vaccines
Most providers leave about two weeks either side.
Wait 1–2 weeks
Dissolving filler
One to two weeks before replacing it, so the area settles.

Insurance Coverage

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Insurance does not cover cosmetic filler. One exception: facial volume loss from HIV medication, where some products are approved and coverage is sometimes available.

Ask Your Doctor

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If you are pregnant or breastfeeding
Ask the doctor managing your pregnancy or breastfeeding before having it.
If you have an autoimmune condition
An inflammatory condition counts too. Delayed inflammatory reactions are more of a concern here, so have a specific conversation, not general reassurance.
If you get cold sores
Say so before lip filler. An antiviral started beforehand prevents most outbreaks.
If you take a blood thinner
A bleeding disorder counts too. Expect more bruising, never stop the medicine yourself, and tell the injector so they can use a cannula.
If you have had permanent filler
Semi-permanent counts too. It changes what can be done next and cannot be dissolved, so bring the details of what was used.
If you have had a blocked vessel
A vascular occlusion or filler nodule at any time. It must be known before the needle goes in — it changes the area, the product and the technique.
If you have dental work coming up
Or a vaccination. Ask about timing — most providers leave about two weeks either side.
If your concern is loose skin
Sagging, or lines that only appear when you move, count too. This is probably the wrong treatment; adding volume to loose skin makes it heavier, not tighter.
If you have an infection in the area
An inflamed spot or active acne counts. Wait until it has cleared.
If you are asking about the nose or brows
The highest-risk areas for blocking a vessel. Ask how many the injector has done and what their emergency plan is.

At-Home Versions

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Hyaluronic acid serums
Okay alternative
They hold water in the surface layers and make skin look temporarily plumper. They cannot reach the layer filler is placed in, and no serum restores lost fat or bone.
Daily sunscreen, SPF 30 or higher
Good alternative
Does not add volume, but it is the single strongest thing you can do for how your face ages, and it protects the skin quality that filler cannot fix.
Topical retinoid
Good alternative
Improves skin thickness, texture and fine lines over months. A companion to filler rather than a substitute, and worth having in place first.
Facial exercises, massage tools and gua sha
Okay alternative
They move fluid and can reduce puffiness for a short while. There is no good evidence they restore lost volume or lift tissue.
Hyaluron pens and filler bought online
Bad alternative
The FDA has warned against needle-free hyaluron pens, because the depth and placement cannot be controlled. Filler sold online is often not what the label says, and the injuries it causes are the serious kind.

How It Compares

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Botulinum toxin
Botulinum toxin
Different job
Different job. Relaxes the muscles that create movement lines. It adds no volume, and filler softens no frown lines, which is why the two are used together far more often than one is chosen over the other.
Collagen stimulators
The same
Poly-L-lactic acid and similar products build volume gradually over three to six months instead of instantly, and the result often lasts around two years. The trade is patience and the fact that they cannot be dissolved if you dislike the outcome.
Fat transfer
The same
Your own fat, moved from elsewhere, with the potential to last for years. It is a surgical procedure with anesthesia and real downtime, and how much of the fat survives varies a lot between people.
Thread lifts
Worse
Marketed as a lift without surgery. The effect is usually modest and short-lived for the cost, and the threads dissolve over months.
Facelift or neck lift
Different job
The only real answer to loose skin. It repositions tissue rather than adding volume. It is surgery, with the recovery, cost and permanence that means.
Lasers, peels and microneedling
Different job
For a different target. They improve skin surface, texture and pigment. They do not restore volume, and filler does not improve skin quality, so many people end up doing both over a year.

Finding a Provider

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Filler is the cosmetic injection with a genuine emergency attached, and the difference between a good outcome and a serious one is almost entirely the person holding the syringe.

Who may legally inject varies by state — typically physicians, physician assistants and nurse practitioners, with registered nurses under supervision in many places. Legal permission is not training. Ask how long they have been injecting, how many a month, and whether they do your areas routinely.

Ask these and expect immediate answers rather than reassurance. Which product, and how many syringes or milliliters. Needle or cannula, and why here. Do you keep hyaluronidase on site, and how much. Have you managed a vascular occlusion, and what is your protocol. Who do I call at 10pm on a Saturday. Are photographs taken. Ask to see the syringe in its labeled packaging before it is opened.

Red flags: no hyaluronidase in the building, or vagueness about it. Product that arrives already drawn up, in an unlabeled syringe, or in packaging not labeled for your country. Prices far below market, which usually means product bought outside normal channels. Hyaluron pens or needle-free devices, which the FDA has warned against because depth cannot be controlled. Injections at a party, a salon, a hotel or someone's home. No medical history, no consent, no photographs. An injector who dismisses the vascular occlusion question. Pressure to treat more areas than you came for, or to buy a package. Permanent filler as a first treatment. And for the nose, anyone treating it casually, since it is the highest-risk area on the face.

Myths

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  • "Hyaluronic acid serum does the same thing as filler." It does not. The serum holds water in the outer skin, so skin looks plumper for a few hours. Filler is a cross-linked gel under the skin, in a different layer, for months.
  • "Filler is permanent." Hyaluronic acid filler is not, and it can be dissolved on purpose. Some persists longer than quoted, and permanent fillers made of plastic beads are a genuinely different decision.
  • "Filler stretches your skin, so once you start you have to keep going." No good evidence that ordinary volumes do this. What people notice is the return to their own baseline after months of looking fuller.
  • "Dissolving is completely risk-free." A useful safety net, not a reset button. Hyaluronidase can cause allergic reactions, dissolves some of your own hyaluronic acid, and can leave the area looking temporarily deflated.
  • "Bad filler is what filler looks like." Obvious filler is a dose and placement result. Product in the wrong layer, the wrong quantity, or repeated year after year without reassessment is what people recognize, not the material.
  • "Fillers are not safe on deeper skin tones." They are used routinely. The pigment risk comes from needle trauma and bruising, not the gel, and it is manageable with technique and aftercare.

Questions Patients Ask

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How long does filler last?

Six to twelve months in the lips, often twelve to twenty-four in structural areas like cheeks, chin and jaw. Movement breaks it down faster, and some persists longer than expected without being visible.

Does it hurt?

Pressure and pinching more than sharp pain, and most fillers contain local anesthetic so it eases as it goes in. Lips are worst by a distance. Numbing cream is standard.

Can filler be removed if I do not like it?

Hyaluronic acid dissolves with an enzyme, usually within days. Calcium hydroxylapatite, poly-L-lactic acid and permanent fillers do not, a strong argument for starting with hyaluronic acid.

What is vascular occlusion, and how likely is it?

Filler blocking a blood vessel and cutting off the blood supply to skin, or rarely the eye. Uncommon, and it is why filler belongs with a trained medical injector who keeps hyaluronidase on site. Warning signs are severe or increasing pain, skin turning white then blotchy and dusky, and any vision change. Treated urgently, the sooner the better.

Why does filler sometimes look obvious?

Almost always how much was used and where, not the product. Volume added year after year without reassessment, or gel too close to the surface, is what people recognize.

Will filler help my dark circles?

Only if the darkness is a shadow cast by a hollow. If it comes from pigment, or thin skin showing the vessels underneath, filler will not brighten it — and under-eye filler risks lasting puffiness. Ask what is causing yours.

References

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