The Role of Hyaluronidase in Aesthetic Medicine

Last updated: 9 August 2026

Hyaluronidase is a naturally occurring enzyme that has become an essential safety tool in aesthetic medicine. Its ability to dissolve hyaluronic acid (HA) fillers makes it invaluable for managing complications, correcting unsatisfactory results, and providing patients with the reassurance that HA filler treatments are reversible. Understanding hyaluronidase empowers patients to make informed decisions about their aesthetic care.

What Is Hyaluronidase?

Hyaluronidase is an enzyme that catalyses the hydrolysis (breakdown) of hyaluronic acid by cleaving the glycosidic bonds within the HA molecule. In the UK, the most commonly used pharmaceutical preparation is Hyalase (hyaluronidase 1500 IU). The enzyme occurs naturally in the human body, where it plays a role in tissue remodelling and fluid regulation.

Dr Oliver Grant, aesthetic medicine specialist and clinical trainer, explains: “Every clinic that performs HA filler treatments should have hyaluronidase immediately available. It is the safety net of our profession, the ability to reverse a treatment completely is unique to HA fillers and is one of the primary reasons the evidence supports them over permanent fillers.”

When is hyaluronidase used?

Emergency Situations

The most critical application is in managing vascular occlusion, a rare but serious complication where filler inadvertently compresses or enters a blood vessel. A 2020 consensus paper in Aesthetic Surgery Journal established that immediate hyaluronidase administration is the primary emergency intervention, potentially preventing tissue necrosis and scarring.

Signs of vascular occlusion include immediate blanching (whitening) of skin, severe pain disproportionate to the injection, dusky or mottled skin discolouration, and delayed capillary refill.

Corrective Situations

• Overfilling: When too much filler has been placed, creating an unnatural appearance
• Asymmetry: When filler placement results in uneven contours
• Migration: When filler has moved from its original placement site
• Nodules or lumps: When filler creates palpable irregularities
• Tyndall effect: When superficially placed filler creates a bluish discolouration
• Patient dissatisfaction: When the patient simply wishes to return to their pre-treatment appearance

Before revision treatment

Hyaluronidase is sometimes used to dissolve existing filler before placing new filler. This allows the practitioner to start fresh with optimal product placement.

How hyaluronidase works

When injected into or adjacent to HA filler, hyaluronidase breaks down the cross-linked HA molecules into smaller fragments that are then naturally absorbed by the body. The dissolution process begins within minutes, with visible reduction typically apparent within 24-48 hours.

Occasionally, a second treatment is needed for complete dissolution.

The treatment process

Before Treatment

A thorough assessment determines the location, type, and approximate volume of filler to be dissolved. An allergy test (skin prick test) may be performed, particularly for patients with known allergies to bee or wasp stings, as hyaluronidase is related to enzymes found in insect venom.

During Treatment

• The area is cleansed and may be numbed with topical anaesthetic
• Hyaluronidase is injected directly into or around the filler deposit
• The dose is calculated based on the estimated amount and type of filler
• Gentle massage may be applied to distribute the enzyme
• The procedure takes 10-20 minutes

After Treatment

Swelling and redness at the injection site are common for 24-48 hours. The filler dissolves progressively over 24-72 hours. A review appointment is typically scheduled at 1-2 weeks to assess the result and determine if additional treatment is needed.

Important Considerations

• Hyaluronidase dissolves both injected HA filler AND the body’s natural hyaluronic acid in the treated area, though natural HA regenerates within 2-4 weeks
• It is specific to hyaluronic acid and cannot dissolve other types of filler (calcium hydroxylapatite, poly-L-lactic acid, silicone)
• There is a small risk of allergic reaction (estimated at less than 0.1%)
• Results may appear slightly deflated immediately after treatment as natural HA is also affected, this corrects as the body replenishes its own HA
• New filler can be placed 2-4 weeks after dissolution once tissues have recovered

Frequently asked questions

Does dissolving filler with hyaluronidase hurt?

The injection itself is similar in discomfort to the original filler treatment. Some patients report a mild stinging or burning sensation as the enzyme begins to work, but this subsides quickly. Topical numbing cream can be applied for comfort.

Will dissolving filler make me look worse than before I had filler?

Temporarily, the treated area may appear slightly deflated as both the filler and some natural HA are dissolved. However, your body will replenish its natural HA within 2-4 weeks, and the area should return to its pre-filler appearance.

How quickly does hyaluronidase work?

The enzyme begins working immediately, with noticeable reduction within hours. Full dissolution typically occurs within 24-72 hours, though some denser fillers may take slightly longer. A follow-up assessment at 2 weeks confirms the result.

Can any practitioner administer hyaluronidase?

Hyaluronidase is a prescription-only medicine in the UK and should only be administered by appropriately trained medical professionals. All practitioners who perform HA filler treatments should be competent in hyaluronidase administration as part of their complication management training.