Dissolving Filler (Hyaluronidase): When and Why

What Hyaluronidase Is and How It Works

In one line

Hyaluronidase is an enzyme that breaks down hyaluronic acid. It breaks the chemical bonds in the HA gel and converts it from a solid gel to a liquid the body absorbs. The effect begins within minutes and completes within 24–48 hours.

Hyaluronic acid, even in its crosslinked form, is a polymer of sugars. Hyaluronidase is an enzyme that exists naturally in the body — it is part of the body's natural mechanism for breaking down HA. When injected at high concentration into an area that contains filler, it accelerates breakdown dramatically: what the body would do over months happens in hours.

What It Dissolves and What It Does Not

Crosslinked HA (filler) — yes. This is the primary target.
The body's natural HA — yes, partially. Hyaluronidase does not distinguish between injected HA and native HA. As a result, after dissolving the area may appear "more hollow" than the original state. This is temporary — the body regenerates its natural HA within days to weeks.
Radiesse (CaHA) — no. Hyaluronidase does not act on calcium hydroxylapatite.
Sculptra (PLLA) — no. Collagen the body has produced cannot be enzymatically broken down.

This is one of the main reasons HA is considered a safer choice, especially for a first treatment: if something does not go as planned, there is an "undo button."

When Dissolving Is Needed

There are three categories of reasons to dissolve filler, differing in urgency and approach:

1. Emergency: Vascular Occlusion

When filler occludes a vessel, dissolving is performed immediately — right then, without waiting. This is the only situation in which hyaluronidase is an emergency treatment. The amounts are large (200–600 units and up), and the injection is along the path of the occluded vessel. The goal: break down the HA blocking flow and restore blood supply to the tissue before necrosis occurs.

2. Correction: Undesired Result

Overcorrection — too much was injected. The area looks too full, puffy, unnatural.
Asymmetry — one side differs from the other in a way that cannot be corrected by adding.
Lumps and nodules — irregularities that do not resolve with massage.
Tyndall effect — a bluish tint under the eyes from HA that was placed too superficially.
Migration — filler that has moved from its location and creates a bulge elsewhere (for example, HA from the lips that rises above the vermillion border).

3. Preference: A Desire to "Reset"

Sometimes patients decide they want to return to their natural state — without filler. Or they want to "start over" with a different practitioner. This is an entirely legitimate reason. Dissolving allows a return to baseline and redesign.

How Dissolving Is Performed

Sensitivity test — hyaluronidase is derived from animal tissue. There is a (low) risk of an allergic reaction. Some practitioners perform a preliminary skin test. If there is a history of allergy to bees or wasps — it must be taken into account.
Targeted injection — the hyaluronidase is injected directly into the area where the filler is located. The amount depends on the amount of HA that needs to be broken down and the type of product (fillers with high crosslinking require more enzyme).
Massage — after the injection, gentle massage distributes the enzyme and ensures it reaches all the filler.
Wait and assess — the effect begins within minutes but continues for 24–48 hours. Final assessment after two days. Sometimes an additional treatment is needed if not all the filler has broken down.

What It Feels Like

The injection itself feels similar to filler injection — pressure and discomfort, not sharp pain (with local anesthesia). After the injection, there is temporary swelling that lasts a day or two. Sometimes redness. Usually — rapid recovery.

Realistic Expectations

Important to understand

Dissolving is not a "perfect undo button." It works well, but it has limitations.

Not always precise — hyaluronidase breaks down all HA in the area — both the filler and the natural HA. It cannot be "tuned" to break down exactly 40% of the filler. So, after dissolving, the area may look more hollow than the original state. This resolves over weeks.
Sometimes more than one treatment is needed — fillers with high crosslinking (such as Voluma) break down more slowly. 2–3 treatments may be required.
Old filler is harder — HA that has been in the tissue for a long time begins to "integrate" into the tissue. Dissolving still works, but sometimes less smoothly.
Works only on HA — if the filler is Radiesse, Sculptra, or silicone — hyaluronidase will not help.

Timeline: From Dissolving to Re-Injection

Stage	Time	What happens
Hyaluronidase injection	Day 0	The enzyme begins breaking down HA. Immediate swelling in the area.
Main breakdown	24–48 hours	Most of the HA breaks down. Swelling subsides. The area may look hollow.
Stabilization	Week 1–2	Natural HA regenerates. Tissue stabilizes. Assessment of the result.
Final assessment	Week 2–4	If further dissolving is needed — it can be done. If dissolving is complete — re-injection can be planned.
Re-injection	Two weeks or more after the last dissolving	The tissue is ready to receive new filler. The wait matters so the tissue can stabilize.

The wait between dissolving and re-injection matters. Injecting too early into an area still affected by hyaluronidase may cause the new filler to be broken down — which undoes the treatment.

Our Approach to Dissolving

We view dissolving as an important and legitimate tool — not a "failure." Sometimes dissolving is the right step:

When a patient comes in with old filler from another practitioner and wants to redesign — we offer a "reset" and establish a new baseline
When there is migration or overcorrection — dissolving is simple, safe, and delivers a good result
When a patient has simply decided they prefer a natural appearance — that is a legitimate choice we support

What we do not do: we do not dissolve another practitioner's filler without seeing documentation or at least understanding what was injected and when. We need to know that it is HA (and not another material) before we inject hyaluronidase.

Frequently Asked Questions

Is dissolving filler painful?

With local anesthesia — it is not sharp pain. There is pressure and discomfort, similar to filler injection itself. After the injection there is swelling and tenderness for a day or two. Many patients describe dissolving as "less uncomfortable" than the original filler injection.

After dissolving, will I return exactly to the state before filler?

Not always exactly. In the short term (days), the area may look more hollow than the original state because natural HA is also partially broken down. This resolves. In the long term, most patients return to a state very close to the original. If there were repeated injections of large amounts over years, the tissue may have stretched — and then the "natural" state will not be identical to how it was before the treatments.

How much does dissolving filler cost?

The cost depends on the amount of hyaluronidase needed and the complexity of the case. Usually, a simple dissolving (one area, small amount) costs less than a filler treatment. If dissolving is required following a treatment of ours that did not produce the desired result — we do not charge for it.