Filler migration: what it is and what to do

Timing is the clearest test. Swelling appears within hours, peaks in the first day or two and resolves within a week. Migration appears weeks or months after treatment and does not resolve at all — it stays exactly as it is, or slowly gets worse with each subsequent appointment.

Appearance is the second test. Swelling is diffuse and involves the whole lip. Migration is defined: a distinct ridge with an edge to it, sitting above the vermilion border, often more pronounced on one side, and frequently visible as a shadow in photographs before it is obvious in the mirror.

Touch is the third. Migrated filler usually feels firmer than the surrounding tissue and can be felt as a discrete band under the skin above the lip. If you are unsure, take a photograph in daylight from the side — migration is far more obvious in profile than face-on.

Too much product for the tissue is the commonest reason. A lip can hold a certain volume; beyond that, the product has to go somewhere, and the path of least resistance is upward into the softer tissue above the border.

Too frequent treatment is the second. Topping up before the previous filler has substantially gone means each appointment adds to a lip that is already at capacity, and the cumulative volume — not the volume of any one session — is what pushes product out of place.

Placement is the third: product deposited too superficially, or too close to the border, has less to hold it. And a firm, highly cross-linked gel used in a lip is more likely to sit as a defined ridge when it does move, which is one reason I prefer softer gels here.

Massaging or pressing the lips in the first days can contribute, which is why the aftercare advice about not manipulating them is not arbitrary.

The instinct when a lip looks unbalanced is to fill the part that looks deficient. In a migrated lip that is precisely wrong: the problem is that there is already too much product in the wrong place, and adding more increases the pressure that caused it.

It also disguises the problem temporarily. A larger lip makes a shelf above it less obvious for a while, so people top up, feel better for a month, and return with a worse version of the same thing. I see this pattern regularly and it is why the answer is so often to reset.

The other reason to stop adding is that migrated filler in the perioral area can be surprisingly long-lived. Hyaluronic acid in a low-movement site breaks down slowly, so waiting it out can mean waiting years rather than months.

Hyaluronidase is an enzyme that breaks down hyaluronic acid filler. Injected into the affected area it clears the migrated product, usually within twenty-four to forty-eight hours, and often in a single session — though stubborn or long-standing migration sometimes needs two.

It is a medical procedure and it has real risks. Allergic reaction is uncommon but possible, which is why an allergy assessment and, where appropriate, a patch test come first, and why it should only be performed by someone equipped to manage a reaction. It also does not discriminate: it will dissolve your own natural hyaluronic acid in the area alongside the filler, which is temporary but worth knowing.

The lips look deflated afterwards — sometimes more deflated than your true baseline — and that is normal. Your own hyaluronic acid replenishes over a couple of weeks. I would not re-treat for at least two weeks, and I would rather wait four so that what we are building on is genuinely your starting point.

Once the lip has been reset, the things that prevent it happening again are all about restraint: smaller volumes, longer intervals, a softer product, and a practitioner who will tell you when to stop.

Leave at least six months between lip appointments as a default, and longer if there is still visible product. Let it go fully at least occasionally so you and I can see what your actual baseline is rather than guessing at it.

And be wary of any practitioner who agrees to top you up without examining what is already there. The most common route into migration is a series of individually reasonable decisions made by someone who never assessed the cumulative effect.