How Long Does Hyaluronidase Take to Work?
Dissolving filler is quick, but the mirror on day one is misleading. Medical Director Dr Sin Yong sets out what happens hour by hour and week by week, how to tell it is working, and why some filler needs more than one session.
Treatment page: dissolve filler and filler correction in Singapore.
WhatsApp to Enquire →Key facts ↓Hyaluronidase starts to break down hyaluronic acid filler straight away. Softening is usually felt within hours, most of the visible change comes within 24 to 48 hours, and the result is judged at about two weeks once swelling has settled. Firm, long-standing or layered filler can need a second session. The enzyme itself is short-lived in tissue, so it does not keep dissolving for weeks.
- First hours: the treated area feels softer; swelling from the injection can hide the change.
- 24 to 48 hours: most of the dissolving that is going to happen has happened.
- Two weeks: swelling has gone, the area is reviewed, and a second dose is decided if filler remains.
- The enzyme is cleared quickly: it is inactivated in tissue within a short time, so the effect does not continue indefinitely [1].
- Not all filler gives way equally: firmer gels and larger deposits tend to need more enzyme or a repeat session.
A realistic timeline
- During the appointment. Small amounts are injected into the filler. Some lumps flatten while you are still in the chair.
- Same evening. The area is softer and often puffy. Swelling is from the fluid and the injection, not a sign of too much or too little.
- Day 1 to 2. Most of the change shows. Bruising, if any, is at its most visible.
- Day 3 to 7. Swelling settles and the shape becomes clearer.
- Week 2. Review. Remaining filler is treated with a second small dose, or the area is left to settle.
- Week 4 onward. If new filler is wanted, it is planned once the tissue is stable.
How to know it is working
The lump or fullness feels softer and flatter to the touch, a bluish tint under the eye fades, or a ledge above the lip smooths out. Because swelling can mask the change for a day or two, a photograph taken before treatment is a better guide than the mirror on day one. A scan at review shows directly what has gone; see filler ultrasound scan.
Why filler may not dissolve
- It is not hyaluronic acid. Collagen stimulators, permanent fillers and fat do not respond. See which fillers cannot be dissolved.
- The enzyme did not reach it. Filler that is deep, walled off or in a different spot from where it is felt can be missed without a scan.
- The dose was small on purpose. Staged dissolving starts low to avoid removing too much.
- The gel is resistant. Firm, highly cross-linked filler breaks down more slowly and may need a repeat dose.
- The lump is not filler. Scar tissue, an inflammatory nodule or a cyst needs different treatment.
How long before new filler?
Most doctors wait until the area has settled, commonly two to four weeks, before placing new filler, so that the starting point is clear. In an emergency such as blocked blood flow the timing is different: the enzyme is given at once, in higher and repeated doses, until blood flow returns [2].
Results vary between people. See hyaluronidase side effects and dissolving filler in Singapore.
Frequently asked questions
How quickly does hyaluronidase dissolve fillers?
It starts working at once. Softening is usually felt within hours and most of the visible change comes within 24 to 48 hours. The final result is judged at about two weeks.
How do you know if hyaluronidase is working?
The area feels softer and flatter, and fullness, a lump or a bluish tint reduces over one to two days. Swelling from the injection can hide this at first, so compare with a photograph taken beforehand.
Why won't my fillers dissolve with hyaluronidase?
The usual reasons are that the product is not hyaluronic acid, the enzyme did not reach the deposit, the first dose was deliberately small, or the lump is not filler. A scan helps tell which.
How long does hyaluronidase stay active?
Only briefly. The enzyme is inactivated in tissue within a short time, although the filler keeps softening over the following day or two as the broken-down gel is cleared.
How to dissolve fillers quickly?
Hyaluronic acid filler is dissolved fastest with hyaluronidase injected by a doctor. No cream, massage or home method does it. Even then, staged doses are used so that too much is not removed.
Can filler be dissolved in one session?
Often, for a small recent deposit. Larger, older or layered filler commonly needs a second session after review at about two weeks.
How soon can I have filler again after dissolving?
Usually once the area has settled, commonly two to four weeks. The doctor confirms the timing at review.
Book an assessment
IN Eternity Clinic, 9 Scotts Road, #12-01 Pacific Plaza, Singapore 228210. By appointment with Medical Director Dr Sin Yong. Monday to Saturday, 11am to 8pm. WhatsApp or call +65 8815 3008. At IN Eternity Clinic a consultation fee applies, and it is waived if you go ahead with any medical treatment; the fee is S
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References
- Jung H. Hyaluronidase: an overview of its properties, applications, and side effects. Arch Plast Surg 2020;47(4):297-300. doi:10.5999/aps.2020.00752
- DeLorenzi C. New high dose pulsed hyaluronidase protocol for hyaluronic acid filler vascular adverse events. Aesthet Surg J 2017;37(7):814-825. PubMed
Figures taken from the published papers and abstracts. Results vary between people; suitability is decided at an in-person consultation.