How dermal filler is done: what happens before, during and after the needle

People who look up how dermal filler is done usually want to know about the needle: whether it hurts, how long it takes, whether it bruises. All of that has an answer, and it comes further down.

But the needle is the short part, and the least decisive one too. The result is settled before it, when someone decides where product goes, which product, at what depth and, above all, whether it should go in at all. Filler placed well in the wrong spot is still the wrong filler.

So this article follows the actual order of the procedure, with the actual weight of each stage.

Before the needle: the stage that decides everything

The conversation and the facial analysis

A person arrives with a complaint: "my smile lines", "my lips got thinner", "my face has dropped". The complaint is legitimate, but it points to the symptom, and rarely to the cause.

A deep nasolabial fold, for example, is often the result of lost support in the cheek. Filling the fold directly treats the shadow and ignores the source, and the result tends to be a face that looks heavier in its lower half. That is why the assessment looks at the whole face, at rest and in motion, from the front and in profile, before thinking about the complaint.

This is also where the questions many people find bureaucratic come in: health history, medications, allergies, autoimmune disease, pregnancy, recurring cold sores and, above all, previous procedures. Anyone who has had filler, even years ago, needs to say so, because what is already there changes the plan.

Doppler ultrasound before injecting

At our clinic, a Doppler ultrasound assessment is part of the procedure. Before injecting, it is used to understand the structure of that specific face and to identify material from previous treatments, including what the person has forgotten about or never knew what it was.

This matters because vascular anatomy varies from person to person. The textbook map is an average, and the face in the chair does not always follow the average.

The plan

With the analysis done, the plan defines three things: where product goes, which product, and at what injection plane. Sometimes it defines a fourth, which is "not today".

Injection planes: depth is half the result

The same hyaluronic acid, placed at different depths, does different things. That is why "filler" is a single word for several procedures.

The logic is structural: what supports goes underneath, what refines goes on top. A firm product placed superficially becomes palpable and visible. A very fluid product placed deep supports nothing.

Each plane also has its own vascular pathway, and knowing that relationship is what separates safe injection from lucky injection. In thin skin, such as around the eyes, product placed too superficially can show through, with a bluish tint under the skin. It is one of the reasons the choice of depth cannot be generic.

During: the injection step by step

1. Record photos, in the same light and at the same angle, for comparison later.

2. Marking of the points and treatment areas with the face in a neutral position.

3. Rigorous skin antisepsis. All makeup comes off.

4. Anesthesia. Topical anesthetic on the area and, in most current products, local anesthetic already built into the gel, which works as the product goes in.

5. Injection with a needle or cannula. The needle is precise for defined points, especially in the deep plane. The cannula has a blunt tip, enters through a small opening and glides between tissues, and is useful for distributing product over larger areas with fewer entry points. Neither technique is better than the other: each suits a given area and plane, and often both are used in the same procedure.

6. Slow injection in small amounts, with constant reassessment of the face. With little product and time to look, it is possible to stop before excess.

7. Gentle molding, when indicated, to settle the product.

8. Doppler ultrasound afterward, to confirm there is no compression of a vessel or artery.

That last step is what turns "it was safe" from an impression into a verification. Vascular complications are rare, and when they happen, reaction time changes everything. Knowing before the person leaves is a different matter entirely.

Time in the chair varies with the number of areas. The injection itself is short. Assessment and planning take longer than it does, and they should.

After: what is normal and what is not

Normal in the first few days: swelling, tenderness to the touch, small bruises at the entry points, and some irregularity that settles. Lips swell more than other areas, and the first-day result is not the final result.

Usual aftercare: avoid pressing or massaging the area on your own, hold off on intense exercise, excessive heat and alcohol for the first few days, and follow the specific instructions for the area treated.

Not normal, and calls for immediate contact: severe and increasing pain, skin turning pale or purplish in a patch, and any change in vision. These are signs of possible vascular compromise, and this is not the moment to wait and see if it passes.

DIY dermal filler: there is no safe version

The search for "DIY filler at home" comes from two directions, and both deserve a direct answer.

Homemade filler recipes (masks, creams, gelatin, "natural Botox") fill nothing. They hydrate the surface and, at best, reduce puffiness for a few hours. No cosmetic crosses the skin down to the plane where volume is lost.

Injection done at home or by someone unqualified, with product bought online, is the dangerous version. The problem goes beyond technique. What is missing is product with verifiable origin, sterility, knowledge of the planes and the vascular pathways and, above all, the ability to recognize and treat a complication on the spot. A vascular occlusion requires an immediate response, with the right materials on hand.

A useful tip: every filler legally sold in Brazil is registered with Anvisa, the Brazilian health regulator, and you can look it up by product name on the agency's website. It is worth asking for the name and checking.

What are the risks of facial filler?

The most common ones are mild and temporary: swelling, bruising, tenderness. Next come the aesthetic ones: asymmetry, excess, visible or palpable product, migration. These can usually be corrected, and this is where hyaluronic acid has a real advantage, because it can be dissolved with hyaluronidase, which the clinic also administers.

The serious risk is vascular: product compressing or entering a vessel. It is rare, but it is the reason Doppler is part of the process here, before and after.

What is the riskiest place to inject filler? The areas with the highest concentration of vascular risk are the glabella (between the brows), the nose and the area around the eyes.

What is the downside of filler? It is temporary, it requires maintenance, and the result depends entirely on the judgment of the injector. The product is the same in many hands; what changes is the criteria of the person holding the syringe.

Which area hurts the most?

The lips, by a wide margin. They are the most innervated area of the face. Areas treated in the deep plane, such as the cheekbones and jaw, tend to bother people less than they expect, especially with anesthetic built into the product. The sensation most often reported is pressure, more than pain.

How long does the effect last?

It depends on the product, the area, the injection plane and each person's metabolism. Areas with a lot of movement, such as the mouth, tend to last less than areas of deep support. Be wary of anyone who promises an exact timeframe: duration is not a measure of quality. A natural result that lasts less is better than an exaggerated one that lasts more.

Can people with autoimmune disease get filler?

There is no single answer. It depends on the disease, its current phase and the treatment underway. It is an individual decision, made through the assessment and often through a conversation with whoever follows the person's care. Active disease is a reason to wait. The information needs to come up at the consultation, never afterward.

How much does facial filler cost?

We do not publish prices, and we are wary of anyone who sells filler by the syringe like a product off the shelf. What makes up the cost is the plan: how many areas, which product, how much product, and the assessment that comes first, including the Doppler. Two people with the same complaint may need completely different plans, and one of them may leave with no injection at all.

What is the best filler for the face?

The one made for that area and that plane. Hyaluronic acid is the most widely used because it is versatile and reversible, and it comes in different densities precisely because each plane calls for a different one. When the goal is to stimulate collagen and improve firmness over time, a biostimulator comes in, which is a different category with a different logic. There is no "best" outside the context of a specific face.

What do the before and after look like?

Done well, the after should look like the same person, rested. The comparison that counts is the face in motion, not a static photo in flattering light. If the expression changed, the smile looks different or the person now looks "done", the result failed, even if the fold has disappeared. Here, the quality of a filler treatment is measured by what it preserves.

When we advise against it

• When the complaint is significant sagging, not volume loss. Filling to stretch produces a heavy face, and the path is usually a different one.
• When there is already unknown product in the area and it is not yet clear what it is, where it is and what state it is in. Understand first, decide later.
• When the expectation is to change the face. Filler restores and balances. Transforming features is a different conversation, and usually not ours.
• With an active infection or active herpes in the area to be treated.
• With active autoimmune disease, until it stabilizes and with alignment from whoever manages the case.
• Pregnancy and breastfeeding. An elective procedure waits.

Frequently asked questions

How long does the injection take?

The injection itself is quick. Most of the appointment is taken up by the assessment, the planning and the Doppler before and after, and that is how it should be.

Can I go back to my routine the same day?

In most cases, yes, with the aftercare for the first few days. Swelling and bruising can appear, so it is best not to book it the day before an important event.

If I don't like it, can it be reversed?

With hyaluronic acid, yes: hyaluronidase dissolves the product. It is one of the reasons it is the most widely used filler in the face.

Is a needle or a cannula better?

It depends on the area and the plane. Each has its indication, and many procedures use both.

Does filler make the face look artificial?

What does that is excess, the wrong plane or the wrong area. The product itself does not have that effect.

Do I need to do all the areas at once?

No. It is often better to work in stages, looking at the face between one and the next. Little product and time to assess go wrong less often than a lot of product in a single session.

Is there DIY dermal filler that works?

No. Homemade recipes do not reach the plane where volume is lost, and injection done outside a clinical setting, by someone unqualified, is the highest-risk scenario in facial aesthetics.