Permanent Fillers: What Is Known and Late Risks

The debate over definitive-effect materials in orofacial harmonization (HOF) is old and still current. On one side, the argument of convenience: inject once and never come back. On the other, the clinical experience of those who treat the patient who, years later, has nodules, asymmetry, or an inflammatory reaction to a material that cannot be removed. This guide summarizes what is known about the categories, the late risks, and the approach for those who encounter this patient, at a review level. Indication and use of any material are the decision of the qualified professional, according to the product registration, the package insert, and the rules of their professional council in Brazil.

What is meant by "permanent filler"?

The term covers materials that the body does not break down, or breaks down very slowly, so that the effect lasts for many years or permanently. In clinical vocabulary, the permanent filler is the counterpart of absorbable gels such as hyaluronic acid.

The classification most used in practice separates them, in simplified form, like this:

The boundaries between categories are not always sharp, and the actual time the material stays depends on the material, the area, and the patient.

What does the literature describe about complications?

Without numbers, which vary by material and series, what is described consistently is the diversity of presentations and the possibility of late onset.

1. Nodules and irregularities. They can be palpable or visible, single or multiple, and appear years later.
2. Granulomas. A chronic foreign-body inflammatory reaction, with mass formation. It can appear suddenly after a trigger, such as infection, trauma, or vaccination, and forms with no apparent trigger also exist.
3. Migration and displacement. The material can move and change contours.
4. Asymmetry. Hard to correct when the volume cannot be adjusted.
5. Infection, biofilm, and abscess. They can occur early or late. See infection and biofilm after filler.
6. Skin changes over the material. Changes in color, texture, or thickness.
7. Vascular compromise. A risk with any injectable, and with no specific antidote for non-hyaluronic materials.
8. Effect of aging on a fixed volume. The face changes with age, and a volume that does not follow those changes can end up out of place.

Why is reversibility the central issue?

In everyday HOF practice, the ability to step back is a pillar of safety. With hyaluronic acid, there is hyaluronidase to reduce the product in case of error, excess, or complication. With permanent materials, that safety net does not exist in the same way. Correcting an unsatisfactory result may require more complex approaches, in some cases surgical, with an unpredictable outcome.

This difference is the main argument used by those who prefer reversible materials. Those who defend permanent fillers usually restrict them to specific contexts, with experience and careful selection. It is not our place here to recommend or condemn, but part of the duty to inform is that the patient knows reversal is limited. See PMMA: properties, risks, and retreatment.

What should you check before considering a material?

To check the registration, see how to look up an injectable's registration with Anvisa. To read the documentation, how to read an injectable's instructions for use.

How do you care for a patient who already has a permanent filler?

This is the most common situation for those who do not use the material: the patient arrives with it, often with no information. The first consultation has a different goal than usual. More than proposing treatment, the goal is to understand.

1. Reconstruct the history. When, where, who injected, which product, what volume, which areas. Ask for documents and old photos.
2. Examine calmly. Palpation, inspection at rest and in movement, comparison between both sides, signs of inflammation.
3. Map the concern. Is there pain? A nodule? Asymmetry? Does the patient want it removed, corrected, or just to understand?
4. Document everything. Photos, findings, and the conversation, without judging the previous work.
5. Assess the risks of intervening. Manipulating the tissue can trigger a reaction, and the patient needs to know that.
6. Consider a referral. When the complexity exceeds your experience, referring to a colleague or service with more experience in the subject is a responsible approach.

And the patient who wants it removed?

The removal approach varies greatly with the material, the amount, the time elapsed, and the clinical picture. In general terms, the possibilities discussed in the literature include watchful waiting without intervention when the patient is asymptomatic, medical treatment of inflammatory reactions, and surgical approaches in selected cases, usually by professionals with specific training. None of them is trivial, and all should be preceded by an honest conversation about limits and risks.

Avoid promising complete removal or a result "like before". It is better to talk about possible goals, such as reducing symptoms or improving contour, and about stages.

How should the consent address the topic?

For the professional who indicates it, the consent form must be specific. In plain language, it should say that the material stays in the tissue, that removal is not guaranteed and may require more complex procedures, that complications can appear many years later, and that the face keeps aging around the material. It must also describe the absorbable alternatives. See informed consent and the reasoning on liability in civil liability.

For the professional who does not indicate it but treats a patient with a permanent filler, the consent for the new procedure should mention that the presence of the earlier material can change the risk and the result.

How do the decision paths compare?

What should be recorded?

In the patient record, record the material (technical name, lot, expiration date, and registration), volume and area, general technique, photos, specific consent, follow-up instructions, and all later contacts. In case of a complication, the adverse event report may be required, depending on the case and the applicable rules.

What to take into practice

Permanent fillers concentrate the discussion of what safety means in HOF: reversibility, time, and information. Those who indicate them need training, a verified registration, and exemplary consent. Those who treat a patient who already has the material need a careful medical history, an unhurried examination, a complete record, and the humility to refer when appropriate.