What is lip filler?
Today the most commonly used material for lip filler is hyaluronic acid (HA), a laboratory-stabilised form of a molecule that occurs naturally in the body. HA fillers are used to add volume, contour and hydration to the lips, to support lips that thin with age, or to reduce asymmetry between the two sides. The effect is not permanent; the body gradually breaks the filler down.
Although lip filler may look like a cosmetic procedure, it is ultimately a medical treatment: a substance is injected into living tissue, in an area rich in blood vessels and nerves. That is why this article focuses on safety rather than on the cosmetic result.
Why is lip anatomy so important?
The lips are supplied by the upper and lower labial arteries, which branch off the facial artery. Anatomy textbooks highlight a few important points:
- The labial arteries mostly run deep in the lip, between the ring-shaped lip muscle (orbicularis oris) and the mucosa inside the mouth, parallel to the edge of the lip.
- The upper labial artery is usually thicker and more tortuous than the lower one.
- The origin and course of the vessels vary considerably from person to person; not everyone’s arteries are in the same place.
A key concept in the anatomy literature is “safety by depth”: although the exact position of the artery varies, the tissue layer it runs in is more predictable. A trained doctor chooses the injection layer, the type of instrument (needle or blunt-tipped cannula) and the injection speed based on this knowledge. These technical decisions are entirely the doctor’s responsibility and are tailored to each person.
What are the “danger zones” of the face?
Injection anatomy textbooks divide the face into areas where the vessels and nerves are more superficial or less protected. As general information, it is enough to know the following:
- Between the eyebrows (glabella), the nose and the nasal tip: Because of connections between vessels, these are the areas most discussed for the risk of an occlusion extending to the eye.
- The side of the nose and the smile line (nasolabial area): Where the continuation of the facial artery runs.
- The temple: Contains the superficial temporal artery and nerve branches.
- The lips and the corners of the mouth: Related to the labial arteries and, near the corner of the mouth, the facial artery.
- The bony openings below the eye, above the eyebrow and at the chin: The exit points of sensory nerves.
The literature also specifically mentions the glabella, the nasal tip and the upper lip as “watershed” areas, where the blood supply lies on the border between two vascular systems. In these areas, colour changes can appear some distance away from the injection point.
What are the signs of vascular occlusion?
Vascular occlusion is the disruption of blood supply to the tissue when filler enters a blood vessel or compresses it from outside. It is rare, but recognising it early directly affects the outcome. Symptoms usually start during or immediately after the injection; rarely, they can appear hours later.
| Normal and expected | Needs urgent assessment |
|---|---|
| Mild tenderness that gradually decreases | Disproportionate, increasing or throbbing pain |
| Evenly distributed swelling of the lip | Blanching or paleness of the skin or lip |
| Limited bruising that turns yellow and fades | Net- or lace-like purple-blue mottling |
| Colour returns immediately when pressed | Colour returns slowly or not at all when pressed |
| Tenderness that decreases over days | Blisters, pimple-like pustules or crusting in the following days |
| — | Blurred vision, loss of vision, eye pain, double vision (the most urgent situation) |
An important detail: many filler products contain a local anaesthetic, so the initial pain may be masked. That is why colour changes should be taken as seriously as pain. The literature stresses that pustules appearing in the week after filler must always be assessed for vascular occlusion, even if the person has a history of cold sores.
What is done if vascular occlusion occurs?
An important safety advantage of hyaluronic acid fillers is that they can be dissolved with an enzyme called hyaluronidase. When vascular occlusion is suspected, the doctor stops the injection immediately and starts the established emergency protocol; this protocol is based on dissolving the filler and closely monitoring blood supply to the tissue. Time is critical in treatment. Symptoms affecting vision are an emergency requiring ophthalmology support.
For this reason, you have the right to know the answers to these questions at the place where you have filler: Which product is used, and is it genuine? Does the clinic have hyaluronidase and the ability to manage emergencies? If there is a problem after the treatment, whom can I reach, and how?
Who should not have lip filler, or should postpone it?
- Pregnancy and breastfeeding
- An active cold sore, wound or skin infection on the lip
- An untreated dental abscess, inflamed gums or recent surgery in the mouth
- Known allergy to the filler’s ingredients
- A bleeding disorder or use of blood thinners not discussed with the doctor
- Uncontrolled systemic diseases and unrealistic expectations
The link between dental health and lip filler
As a dental clinic, this is the point we especially want to highlight: anatomy textbooks point out that infections in neighbouring areas, such as sinusitis or a dental abscess, can carry microorganisms to the filler area. So if there is an abscess caused by decay, inflamed gums or a root canal problem awaiting treatment in the mouth, it is safer to resolve these problems before lip filler.
In addition, the appearance of the lips depends largely on the teeth and bone support underneath. The inclination of the front teeth, missing teeth or worn teeth change the support of the lips. In some cases, what looks like volume loss in the lips is actually caused by reduced tooth and bone support; in that case the priority is to assess the teeth and the bite.
Frequently asked questions
Is vascular occlusion common with lip fillers?
It is a rare but serious complication. Being rare does not make it unimportant; that is why the treatment should be performed by a trained doctor who knows the anatomy, in a setting prepared for emergencies.
How can bruising be told apart from vascular occlusion after filler?
Bruising is usually a limited colour change that turns yellow and fades over time, with mild pain. Vascular occlusion may cause disproportionate pain, blanching of the skin followed by a net-like purple-blue mottling, and slow return of colour when pressed. If in doubt, call your doctor immediately.
Can hyaluronic acid filler be dissolved?
Yes. Hyaluronic acid fillers can be dissolved by a doctor with an enzyme called hyaluronidase. This is an important safety advantage, especially in emergencies.
How long should there be between dental treatment and lip filler?
If there is an active infection, abscess or recent surgery in the mouth, the filler is postponed. For routine treatments, a gap of a few days to a few weeks is usually recommended; your doctor will decide the exact interval.
I get cold sores. Can I have lip filler?
Lip filler is not performed while you have an active cold sore. People with a history of frequent cold sores should mention this at the examination; the doctor will consider the necessary precautions.
Related pages
For an oral and dental examination and information before lip filler, you can message our clinic in Bahçelievler, Istanbul on WhatsApp or call +90 544 289 66 33.
Sources: Pirayesh A, Bertossi D, Heydenrych I (eds). Aesthetic Facial Anatomy Essentials for Injections. 1st ed. CRC Press, 2020. · Kontis TC, Lacombe VG. Cosmetic Injection Techniques: A Text and Video Guide to Neurotoxins and Fillers. 1st ed. Thieme, 2013.
This article is for information only; diagnosis and treatment planning are determined solely by a doctor after an examination.
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\"Dr. Dt. Mehmet Fuat Bozaba, İstanbul Medipol Üniversitesi Periodontoloji Anabilim Dalı\'nda doktorasını tamamlamış uzman diş hekimidir. Bahçelievler\'de Yayla Dental Akademi bünyesinde ileri klinik uygulamalarla hizmet vermektedir. Temel uzmanlık alanları arasında dental implantlar, Khoury ve Urban teknikleriyle ileri kemik rejenerasyonu ve diş eti çekilmelerinin tedavisi (pembe estetik) yer almaktadır. Bugüne kadar 1000\'den fazla implant ve gömülü yirmilik yaş diş cerrahisi ile 700\'ü aşkın diş eti grefti operasyonunu başarıyla gerçekleştirmiştir. Sağlık turizmi kapsamında yurt dışından gelen hastalar için ileri düzeyde İngilizce dilinde tedavi imkanı sunmaktadır.\"
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