"I had this HA five or six years ago. I was told it would absorb in six to twelve months. How can I still feel a ridge now?"
It's a common opening in nose revision clinic. A lot of people's mental image of hyaluronic acid (HA) stops at "it absorbs on its own and is gone after a while." So when that firm ridge on the bridge is still there years later, the first reaction is confusion, even doubting their own memory.
But recent imaging evidence points the other way: HA stays on the face far longer than assumed.
"HA absorbs in six to twelve months" isn't that accurate
HA is metabolised by the body, that's true. But the version where it's "completely gone in six to twelve months" is closer to marketing than to clinical reality.
A 2024 review in PRS Global Open by Master and colleagues is worth knowing. They followed 33 patients with mid-face HA on MRI, and the result was this: every single one still showed an HA signal on MRI, none had completely resolved two years after injection, and one patient was more than fifteen years out from their last injection with residue still visible on imaging. The study directly challenges the conventional claim that HA "only lasts three to twelve months."
In other words, the ridge you're feeling may well still be there, and you're not misremembering.
Key insight: HA is metabolised, but "completely absorbed in a few months" often doesn't hold. Imaging evidence shows it can persist in tissue for years.
Why nose HA lingers in particular
If mid-face HA can last this long, the nose only makes it more noticeable, for a few reasons.
The nose has relatively low blood flow and a small subcutaneous space. Low blood flow means slower metabolism; small space means a little residue feels very obvious. On top of that, HA on the bridge is often injected as a bolus, and the body wraps a fibrous capsule (encapsulation) around it, so material inside the capsule is even harder to clear. Many people, wanting "a bit more projection," top up repeatedly, new layered over old, and that ridge on the bridge just stays.
A 2023 case report illustrates this neatly: a patient who'd had HA in the nasal radix (the top of the bridge) developed a 15mm nodule there ten months later, briefly suspected of being a tumour. High-frequency ultrasound showed it was a capsule-wrapped HA pseudocyst, ultimately aspirated under ultrasound guidance and resolved within a week. Still there at ten months, still clearly visible, says a lot about how reluctant nose HA can be to disappear.
"Absorbed" or "actually still there"?
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| What you're told | What's commonly the case |
|---|---|
| Absorbs in six to twelve months | Imaging shows it can persist for years, slower where blood flow is low |
| If you can't see it, it's gone | Invisible on the surface, still detectable on ultrasound / MRI |
| Another round of hyaluronidase dissolves it all | An encapsulated bolus often won't fully dissolve; repeated dissolving has a cost |
| A lump must mean something new grew | Usually it's that old bolus still there, not new tissue |
For which fillers can be dissolved and which can only be removed, see the nose filler decision matrix. If you've already had several rounds of hyaluronidase and it's still there, keep the cumulative cost of repeated dissolving in mind.
You can feel it, so what's next
The first step isn't to rush to conclude "is there still some" or to top up or dissolve again. It's to see it clearly.
Many "still feeling it years later" cases have never actually had an imaging assessment. High-frequency ultrasound can show which skin layer the residue sits in, how big it is, what material its echo pattern suggests, and its relationship to the nasal vessels. On how ultrasound confirms residue when "I feel it but I'm told it's nothing," see how ultrasound confirms retained nose filler.
Once confirmed, the direction is clear. Early, small-volume HA that hasn't encapsulated can be assessed for hyaluronidase (the enzyme that breaks down HA, used only after an in-person physician assessment); HA that has encapsulated, persists despite repeated dissolving, or has widened the bridge is usually more directly handled by physical removal under ultrasound guidance. A widened, blunted "avatar nose" is another common path, covered in filler displacement and a distorted nose shape.
To be honest about it: HA can be dissolved in theory, but "how cleanly it dissolves" once encapsulated is another matter; removal doesn't come with a "guaranteed 100%" claim either. The complete-clearance rate varies with material, time and degree of adhesion, clinically often around 80–90%. The whole procedure uses gentle pain-controlled local anaesthesia.
Key insight: When you can feel it on your nose years later, the point isn't "why is it still there," it's to see clearly where it is and what it is first, then decide whether to dissolve or remove.
FAQ
Q: Doesn't HA absorb on its own? A: It's metabolised, but that doesn't equal "gone in a few months." Imaging studies show HA can persist in tissue for years, more slowly where blood flow is low (the nose being one such place). If you can feel it, it's usually still there.
Q: It's been over five years. Can it still be dealt with? A: Yes. Residue doesn't disappear with time; as long as ultrasound can locate it, removal can be assessed. The length of time isn't the deciding factor; precise localisation and clean, even removal are.
Q: So I just dissolve it again with another round of hyaluronidase? A: Early, non-encapsulated HA has a chance. But HA on the bridge is often wrapped in a fibrous capsule, where the enzyme can't reach the material inside, so repeated rounds often won't fully dissolve it, and ultrasound-guided removal is more direct.
Q: Could what I'm feeling be something else that grew? A: Possibly, but usually it's that old bolus still there. To tell residue from granuloma, biofilm or scar, ultrasound is the most reliable, so there's no need to frighten yourself.
In closing
"It absorbed long ago" is a fixed impression many people hold about HA, but the ridge you can feel on your nose often contradicts it. HA can last longer than assumed, especially in a nose with low blood flow and little space.
Rather than going round in circles over "why is it still there," see it clearly first, which layer, how big, what it is. You're welcome to use an online personalised assessment or book a consultation, where Dr. Ta-Ju Liu can help confirm with ultrasound whether there's still HA residue in your nose, and the most suitable way to handle it. For the complete picture of how retained nose filler and lumps are repaired, start with the retained nose filler and lumps overview.
References
- Master M, Azizeddin A, Master V. Hyaluronic Acid Filler Longevity in the Mid-face: A Review of 33 Magnetic Resonance Imaging Studies. Plast Reconstr Surg Glob Open. 2024. (All 33 patients still showed HA signal on MRI; none fully resolved two years after injection; one up to 15 years; challenges the "3–12 month" claim.)
- Magacho-Vieira FN, Santana AP. Displacement of Hyaluronic Acid Dermal Filler Mimicking a Cutaneous Tumor: A Case Report. Clin Cosmet Investig Dermatol. 2023. (A 15mm nodule 10 months after HA in the nasal radix; 22MHz ultrasound confirmed an encapsulated HA pseudocyst; removed under ultrasound guidance.)
Editorial Review: This article is educational information, not individual medical advice. Whether HA residue remains in the nose, and the choice between dissolving and removal, must be decided case by case after an in-person physician assessment and ultrasound evaluation. Actual treatment and outcomes vary by individual.
