Lip Filler Techniques and Migration: A Comparison Study

A 2024 study from a single plastic surgery practice compared four ways of injecting hyaluronic acid filler into the upper lip and asked how satisfied patients were three weeks later. Women treated with a fine needle moving from the top of the lip downward reported the highest satisfaction, and the author linked this to less filler drifting above the lip line. The study has real limits, but it adds to the view that technique, not just product, shapes how lip filler settles.

Why this was studied

Lip filler migration means product spreading beyond where it was intended, most often above the border of the upper lip. It can create a soft ridge or "shelf," blur the natural lip outline, or give a puffy look. Migration has many possible contributors, including volume, product type, depth, massage and individual anatomy.

Injectors use different approaches: needles or blunt-tipped cannulas, and different directions of travel through the lip. There has been little direct comparison of how these choices affect migration. This study set out to compare several common approaches while keeping other factors as consistent as possible.

What the researcher did

Dr. Omer Buhsem, a plastic surgeon in Türkiye, reviewed records of 216 healthy women aged 19 to 39 who had upper lip filler between 2017 and 2023. People with very thin lips, recent lip filler or surgery, recent infection around the mouth, frequent cold sores or heavy smoking were not included.

Every patient received the same volume (0.6 mL) of the same hyaluronic acid filler in the upper lip, at the same shallow depth, injected in thin lines by the same surgeon. The women were divided evenly into four groups of 54:

1. Fine needle, moving from the top of the lip toward the bottom
2. Fine needle, moving from the bottom toward the top
3. Fine needle, moving from the side toward the centre
4. Blunt cannula, moving from the side toward the centre

At three weeks, a blinded evaluator recorded satisfaction on a scale of 0 to 5, taking migration above the lip into account.

What they found

The top-to-bottom needle group had the highest average satisfaction, about 4.8 out of 5, and roughly four in five of these patients described themselves as very satisfied. The other three groups averaged between about 3.7 and 4.2, with far fewer "very satisfied" responses. The difference between the top-to-bottom group and each of the others was statistically significant.

No one in any group reported being dissatisfied, and no major complications were seen. The author reported that the top-to-bottom group was the one without upper lip migration and suggested that the direction of the needle influences how filler spreads.

How strong is this evidence?

This is a retrospective comparison, meaning the researcher looked back at past treatments rather than setting up a trial in advance. The summary describes it as randomised, but the methods do not explain how patients were assigned to groups, so it is safest to treat it as an observational comparison.

Other important limits include:

• Short follow-up. Three weeks is early. Migration is often discussed as something that can develop over months or with repeated treatments.
• No direct measurement. Migration was not measured with photographs or imaging. Conclusions rest on satisfaction scores, which are indirect.
• One injector, one product, one volume. Results may not apply to other clinicians, fillers or amounts.
• A narrow group. All participants were young Caucasian women, so findings may differ in other ages, ethnicities and lip shapes.

In short, the study raises an interesting idea about needle direction, but it does not prove one technique is right for everyone. Larger studies with longer follow-up and objective measurements would be needed for that.

What it means for you

For patients, the main takeaway is that how filler is placed matters, alongside how much is used and which product is chosen. Careful, modest volumes placed in the right layer remain central to reducing the chance of migration. Our article on lip filler migration explains the signs to look for and how it can be managed.

You do not need to ask for a particular direction of injection. Technique should be chosen for your anatomy, your goals and any previous treatment. What you can reasonably ask is how your injector thinks about migration and what they do to limit it. The comparison between tools is explored further in our article on cannula versus needle.

Lip filler is not suitable for everyone. It is usually postponed during pregnancy or breastfeeding, with an active cold sore or infection around the mouth, or shortly before dental work. Common short-term effects include swelling, tenderness and bruising, and rarer risks include lumps, infection and blood vessel blockage, which needs urgent care.

Questions to ask at your consultation

• How much filler do you suggest for my lips, and why that amount?
• What do you do to reduce the chance of filler moving above my lip line?
• If I have had lip filler before, should any of it be assessed or dissolved first?
• When would you want to see me again to check how the filler has settled?

Frequently asked questions

Can migrated lip filler be corrected?

Hyaluronic acid filler can usually be dissolved with an enzyme called hyaluronidase. Whether that is needed depends on how noticeable the migration is and what you want. A conservative wait may be reasonable for minor changes.

Does a cannula always cause more migration than a needle?

This study does not show that. The cannula group had lower satisfaction than the top-to-bottom needle group but was similar to two other needle groups. Each tool has pros and cons, and the choice depends on the area and the person.

Does migration happen right away?

Early swelling can look like migration in the first days. True migration is often noticed later, especially after several treatments, which is one reason short studies like this one cannot give the full picture.

If you have questions about lip filler, including whether previous treatment has shifted, a consultation at HealthPark Medical Aesthetics is a chance to review your lips, your history and the options, including choosing not to treat.

Source

Buhsem O. Comparing the effects of different injection techniques used in lip augmentation on filler migration and patient satisfaction. Cureus, 2024. Read the study