Lip filler: how long it lasts, risks and how to choose
How long hyaluronic acid lip filler lasts, the risks according to the evidence, what result is realistic and how to choose a safe clinic in Spain.
5 min readEducational content by RejuvelookUpdated in October 2026
In short
Hyaluronic acid lip filler adds volume, definition or hydration straight away, and it can be reversed. The effect fades over months: in a meta-analysis, 74% still had an improvement at six months and 46% at one year. Common side effects are mild; serious ones, such as a vascular complication, are rare but need a doctor who is prepared.
Key points
- In a meta-analysis, 91% had fuller lips at two months, 74% at six months and 46% at one year.
- Tenderness, swelling and bruising are usual after treatment and settle within days.
- Granulomas are rare (0.6%), but can appear months or years later.
- A vascular complication is uncommon and needs immediate treatment at the clinic.
- Hyaluronic acid can be dissolved with an enzyme if there is a complication or you dislike the result.
Lip filler is one of the most requested treatments in aesthetic medicine. Done well, it looks natural and can be reversed. Done badly, it is one of the easiest treatments to spot. Here is what the evidence says about how long it lasts, what the risks are and how to choose where to have it, whether you live on the Costa del Sol or are here for the season.
What lip filler is and what it does
Hyaluronic acid is a substance your body makes naturally, and it holds water. Lip fillers are gels of stabilised hyaluronic acid, regulated in Europe as CE-marked medical devices. Depending on how firm the gel is, it can add volume, define the border of the lip, correct an imbalance, or hydrate the lips and soften the fine lines around the mouth.
Not all gels behave the same way. Firmer gels support and project; softer ones blend in and hydrate. Part of the consultation is choosing the product and the amount for your lips, not for a reference photo.
How your lips are assessed
The doctor looks at the balance between the upper and lower lip, the outline, the symmetry and the quality of the lip tissue. They also watch how your mouth moves when you talk and smile, and take your teeth and profile into account, because both change how the lips look.
You will be asked about cold sores, allergies, autoimmune conditions, medicines that make you bruise more easily and any previous filler. If you have had filler before and do not know what it was, say so. A permanent filler changes the plan completely.
How long does lip filler last?
You see the result straight away, although swelling exaggerates it for the first few days. What you see at two weeks is the real result.
Over the following months the gel is gradually absorbed. In a meta-analysis of hyaluronic acid lip studies, 91% of people still had a visible improvement at two months, 74% at six months and 46% at one year [1]. An earlier systematic review of almost 4,000 participants found response rates between 71% and 93%, depending on the scale used [2].
In practice, expect it to last somewhere between six months and a year. The product, the amount, your metabolism and how much you move your mouth all play a part. Many people keep their result with a smaller top-up before it has completely gone, rather than starting from scratch.
What to expect, realistically
- Lips that are better defined, more hydrated or a little fuller, in proportion with your face.
- Better balance between the two sides, rarely perfect symmetry, because no lips are perfectly symmetrical.
- Swelling for a few days, and sometimes a bruise.
- A review at two to three weeks to decide whether a small adjustment is needed.
Turning very thin lips into full ones in a single session is not realistic. Gradual changes blend in better and are less noticeable.
Risks, and who it is not for
The most common effects are short-lived. In the meta-analysis above, tenderness affected 88.8% of people treated, swelling 74.3% and bruising 39.5% [1]. These settle on their own within days.
Granulomas (0.6%), a flare of cold sores (0.6%) and angioedema, a marked allergic-type swelling (0.3%), are rare [1]. Granulomatous reactions can appear long after treatment: in a review of published cases, the median was two years after the injection [3]. So a lump that appears later is worth having checked, even if a lot of time has passed.
The most serious complication is vascular: filler entering or pressing on one of the arteries of the lip. Signs include pain, paleness or purple, blotchy skin, and it can damage the skin if it is not treated quickly [4]. It can happen even in experienced hands [6]. That is why it matters that you are treated by a doctor who knows the anatomy of the lips, uses careful technique and keeps on site the enzyme that dissolves hyaluronic acid [5].
Loss of vision from filler is exceptional and is concentrated around the nose, forehead and between the brows. In a review of 198 cases, the lip was the injection site in only one [7].
Lip filler is not recommended in pregnancy or while breastfeeding, during an active cold sore or infection in the area, with an uncontrolled autoimmune condition, or if you have had a severe reaction to filler before.
How to choose where to have it
With lips, the difference between a planned treatment and a rushed one shows quickly. Before you book, check that the clinic is a licensed healthcare centre, that a registered doctor assesses and treats you, that they tell you which product they use and that a follow-up is planned. We cover this in detail in how to choose an aesthetic clinic in Spain.
Be wary of per-syringe offers with no consultation, treatment outside a healthcare setting, and anyone who cannot tell you what they would do if a complication occurred. If English is your first language, make sure the doctor, not only the front desk, can explain the risks to you clearly.
How we approach it at Rejuvelook
At our clinic in Fuengirola we start with a medical consultation about your lips and of your face as a whole. If filler is right for you, we explain what change is reasonable, which product we suggest and why. We work with conservative amounts and review the result once it has settled. If filler is not what you need, we will tell you. We see patients in English or Spanish.
If you would like to know more about hyaluronic acid safety in other areas, read our guide to dark circles and tear trough filler.
What the evidence says
Each statement shows its level of evidence and the sources behind it.
Supported
With caveats
Not enough support
- Late reactions such as granulomas are known mainly from published cases and are probably under-reported.[3]Low-quality evidence
When to see a doctor
Book a medical consultation, or go to A&E if it is severe or sudden, if you notice:
- Severe pain, paleness, cold skin or purple, blotchy patches on or around the lip in the hours after treatment: contact the clinic straight away.
- Any change in your vision after a facial filler: go to A&E (urgencias) or call 112.
- Swelling of the tongue or throat, or difficulty breathing: call 112.
- Hard, painful or growing lumps, even if they appear months or years later.
- Blisters or crusts like a cold sore in the days after treatment.
Frequently asked
Does lip filler hurt?
Lips are sensitive, but most people find it very manageable. A numbing cream is applied and many gels contain a local anaesthetic. The injections themselves take a few minutes.
Can I go back to normal life straight away?
Yes. For the first 24 hours, avoid hard exercise, saunas, strong heat and pressing on your lips. Leave lipstick until the next day.
Will people be able to tell?
For the first few days, a little, because of swelling. Once it settles, a measured treatment simply looks like a more defined version of your own lips. What gives filler away is usually too much product or losing the balance with the rest of the face.
Can I have it before a holiday, a wedding or a flight home?
Yes, with some margin: ideally two to three weeks before. That leaves time for the review and for any bruise to fade. Flying afterwards is fine, but do not plan treatment for the day before you travel.
I get cold sores. Can I still have lip filler?
Usually yes, but mention it at your consultation. Injections can trigger a flare, and the doctor may suggest preventive treatment. If you have an active cold sore, you will need to wait until it has healed.
What if I do not like the result?
First, wait about two weeks for the swelling to settle. If you are still unhappy, hyaluronic acid can be dissolved with an enzyme at the clinic, partly or completely.
Can it be combined with other treatments around the mouth?
Yes. It is often combined with anti-wrinkle injections for the vertical lines above the lip, or with filler at the corners of the mouth. The doctor decides the order and whether to do them in the same session.
References
Sources checked against PubMed or Crossref. Cited as plain text, without links.
- 1.Czumbel LM, Farkasdi S, Gede N, Mikó A, Csupor D, Lukács A, et al. Hyaluronic Acid Is an Effective Dermal Filler for Lip Augmentation: A Meta-Analysis. Front Surg. 2021;8:681028. doi: 10.3389/fsurg.2021.681028. PMID: 34422892.Verified on 2 October 2026
- 2.Stojanovič L, Majdič N. Effectiveness and safety of hyaluronic acid fillers used to enhance overall lip fullness: A systematic review of clinical studies. J Cosmet Dermatol. 2019;18(2):436-443. doi: 10.1111/jocd.12861. PMID: 30636365.Verified on 2 October 2026
- 3.Coppini M, Caponio VCA, Mauceri R, Pizzo G, Mauceri N, Lo Muzio L, et al. Aesthetic lip filler augmentation is not free of adverse reactions: lack of evidence-based practice from a systematic review. Front Oral Health. 2024;5:1495012. doi: 10.3389/froh.2024.1495012. PMID: 39483115.Verified on 2 October 2026
- 4.Kroumpouzos G, Harris S, Bhargava S, Wortsman X. Complications of fillers in the lips and perioral area: Prevention, consultation, and management focusing on ultrasound guidance. J Plast Reconstr Aesthet Surg. 2023;84:656-669. doi: 10.1016/j.bjps.2023.01.048. PMID: 37002059.Verified on 2 October 2026
- 5.Signorini M, Liew S, Sundaram H, De Boulle KL, Goodman GJ, Monheit G, et al. Global Aesthetics Consensus: Avoidance and Management of Complications from Hyaluronic Acid Fillers-Evidence- and Opinion-Based Review and Consensus Recommendations. Plast Reconstr Surg. 2016;137(6):961e-971e. doi: 10.1097/PRS.0000000000002184. PMID: 27219265.Verified on 2 October 2026
- 6.Goodman GJ, Roberts S, Callan P. Experience and Management of Intravascular Injection with Facial Fillers: Results of a Multinational Survey of Experienced Injectors. Aesthetic Plast Surg. 2016;40(4):549-55. doi: 10.1007/s00266-016-0658-1. PMID: 27286849.Verified on 2 October 2026
- 7.Foster J, Aakalu VK, Freitag SK, McCulley TJ, Tao JP, Vagefi MR, et al. Vision-Threatening Complications of Soft Tissue Fillers: A Report by the American Academy of Ophthalmology. Ophthalmology. 2025;132(8):935-944. doi: 10.1016/j.ophtha.2025.01.020. PMID: 40167411.Verified on 2 October 2026
Educational content. It does not replace a medical consultation or provide a diagnosis. Tests and treatments are indicated only after medical consultation and in line with regulation.