Migration, swelling or too much filler: three questions that sort it

Somebody looks at a photograph of themselves from a weekend away and sees a shelf. A pale ridge sitting above the lip border, or a fullness under the eye that catches the light in a way it did not used to. They go online. Within four minutes they have concluded their filler has migrated, and by the next morning they are looking for someone to dissolve it.

Perhaps they are right. Very often they are not, and the cost of getting it wrong is real, because the treatment for one of these is to dissolve product that is doing its job, and the treatment for another is to change nothing and wait.

The original element in this piece is a three question sort, answerable at home in an evening, that separates true product migration from persistent lymphatic swelling from simple over correction, using timing, pressure response and diurnal variation as the three discriminators. Each of those signals is recognised clinically. Nobody has put them into a sequence a patient can run on themselves, and the absence of that sequence is why the word migration is doing far more work in public conversation than it deserves.

What the three things actually are. Migration is product that has moved from where it was placed into an adjacent tissue plane or compartment. It is a genuine phenomenon, documented particularly around the lip and the infraorbital area, and it typically presents late rather than early.

Persistent swelling is fluid, not product. The tear trough region is drained by lymphatics that are easily embarrassed, and hyaluronic acid is hygroscopic, meaning it attracts and holds water. Product placed too superficially, in too large a volume, or in a region with marginal drainage can produce a fullness that is mostly water sitting around a small amount of gel. Reviews of infraorbital filler side effects treat this as one of the commonest problems in the area, and distinguish it from product displacement (Aesthet Surg J Open Forum 2022, Facial Plast Surg 2022).

Over correction is simply more product in the right place than the face can carry. Nothing has moved and nothing is retaining unusual amounts of fluid. There is just too much, and it becomes visible as the surrounding tissue settles or as further syringes accumulate over years.

Question one, when did it appear relative to the last treatment. Write down the date of your most recent syringe in that area, and the date you first noticed the problem, and separately the date it became consistent rather than intermittent.

A change that appeared within days to two weeks of treatment and has been present ever since points toward swelling or over correction. That is the window in which injection related oedema occurs and in which the true result of a treatment is not yet visible.

A change that appeared months or years after the last treatment, in an area that looked correct in between, points toward migration. Product does not usually move immediately. It moves with time, with repeated muscle action, and with subsequent layers placed on top of it. The delayed onset is the single most useful discriminator you have.

A change that has grown steadily across multiple treatment cycles, always slightly more after each one, points at accumulation and over correction rather than at either of the others.

Question two, what happens under firm sustained pressure. In good light, press on the area with a fingertip, firmly, and hold for about ten seconds, then release and look immediately.

If a shallow dent remains for a few seconds before filling back in, you are pressing on fluid. That is pitting, and it is the signature of swelling rather than gel.

If the area feels firm and resists, springs back immediately with no dent, and you can feel a discrete edge or a defined ridge under the skin, you are feeling product. Whether that product is where it should be is the next question, not this one.

If it feels uniformly full and soft with no discrete edge and no pitting, that is more consistent with over correction of a correctly placed product.

Question three, does it change between morning and evening. Look at the area within ten minutes of getting out of bed, and again at nine in the evening, on two separate days, ideally photographing both.

Fluid moves with posture. A fullness that is clearly worse on waking and visibly better by evening is dominated by fluid. It will also be worse after a salty meal, after alcohol, during the premenstrual phase and after a poor night's sleep, and those associations are themselves diagnostic.

Product does not care what time it is. A ridge or a shelf that looks exactly the same at seven in the morning and nine at night is not a fluid problem.

Reading the combination. Late onset, firm with a palpable edge, no diurnal variation: this is the pattern most consistent with migration, and it is the pattern in which asking about hyaluronidase is a reasonable conversation.

Early onset, pitting under pressure, clearly worse in the morning: this is fluid. The management is conservative first, and it is often partially reversible without dissolving anything. Dissolving in this situation may still be the eventual answer if the product is driving the fluid retention, but it is not the first move, and the decision benefits from time rather than urgency.

Gradual accumulation, uniformly full, no edge, no diurnal variation: this is over correction, and the answer is to stop adding, which is harder than it sounds and is the underlying subject of what happens when you stop getting injectables.

Mixed picture: mixed pictures are common, particularly under the eye, where somebody can have all three at once. That is exactly the situation in which a self assessment reaches its limit and an in person examination with a light and palpation is the correct next step.

What the studies do not tell you. There is no published diagnostic study that took patients presenting with periocular or perioral fullness, applied these three tests, and reported how well each predicted what was found on examination or imaging. The three discriminators are drawn from how these problems are described clinically, not from a validated instrument, and the sort should be treated as a way to organise your own observations before an appointment rather than as a diagnosis.

There is also a genuine and underappreciated gap about persistence. Filler in some sites is detectable on imaging far longer than the duration patients are quoted, which complicates any assumption that a problem cannot be product because the treatment was too long ago. That mismatch between quoted duration and actual persistence is worth understanding on its own terms, and it sits behind how long injectables genuinely last.

The practical value. Walking into a review appointment and saying that it appeared fourteen months after the last syringe, feels firm with a defined edge, and looks identical morning and night is a description that leads somewhere. Saying that you think it has migrated leads to a conversation about a word. And if the answer does turn out to be product that needs to come out, the process itself is more nuanced than most people expect, which is covered in what dissolving filler actually involves.