The under-eye area is among the most unforgiving sites for filler. Here’s what every patient should know before booking.
Tear trough treatment — the use of hyaluronic acid (HA) filler to soften the hollow beneath the lower eyelid — has become one of the most requested procedures in aesthetic medicine. Patients come in hoping to look less tired, less hollow, less drawn. And when the result is right, it genuinely changes how a face reads. But the periorbital area is not forgiving of errors. The tissue here is the thinnest on the face, the vascular anatomy is complex, and the margin for error is narrow. Before you book this treatment anywhere, here is what you need to understand.
Why the tear trough is a high-risk zone
The skin beneath the eye sits over the orbicularis oculi muscle, lymphatic channels, and a network of blood vessels including branches of the ophthalmic and facial arteries. The tissue is extraordinarily thin — sometimes just 0.5mm — which means any filler placed here is highly visible. Oedema, lumpiness, and the Tyndall effect (a bluish discolouration caused by filler placed too superficially) are common consequences of poor technique. More seriously, inadvertent intravascular injection carries a real risk of vision loss — a rare but documented catastrophic complication.
The main risks, in order of severity, are as follows:
- Critical: Vascular occlusion — accidental injection into an artery can block blood supply to the eye, with vision loss the most feared possible outcome.
- Serious: Tyndall effect — filler placed too superficially causes a persistent bluish discolouration visible through the skin, often requiring hyaluronidase to dissolve.
- Common: Oedema and migration — incorrect product choice is the most frequent cause of puffiness and filler that moves from the intended site.
- Mild: Bruising and short-term swelling — expected in most patients and significantly reduced by correct technique and cannula use.
Not everyone is a candidate
Tear trough filler is not always the right answer — even for patients with genuine hollowing. Those with significant fat prolapse (the bags that bulge forward beneath the eye), very thin or crepey skin, or prominent festoons are often better served by a surgical opinion. Filler placed over significant fat prolapse can make the area look considerably worse, not better. A good practitioner will tell you this clearly and without hesitation; a poor one will simply take your money and inject. If a practitioner has never turned a patient away from tear trough treatment, that is itself a red flag.
Why product choice matters enormously
Not all hyaluronic acid fillers are alike, and product selection is one of the clearest indicators of a practitioner’s expertise. The tear trough demands a very specific type of filler: thin, malleable, and with low water absorption. Products with high swelling ratios are entirely unsuitable here — they attract fluid into the treated area, causing the chronic puffiness and oedema that so many patients present with after treatment elsewhere. The filler must also be soft enough to move naturally with facial expression and fine enough not to be visible or palpable beneath such thin skin.
At Health & Aesthetics, I use two fillers specifically chosen for the tear trough: Revanesse Revise and Teosyal PureSense Redensity 2 by Teoxane. Both are thin, malleable products with low water absorption, meaning they integrate gently with the periorbital tissue without causing swelling or distortion. They also contains a built-in local anaesthetic, which improves patient comfort during what is an inherently sensitive treatment. These are not general-purpose fillers repurposed for the under-eye — they are products designed and validated for exactly this indication. Using a thicker, more cohesive product in this area, is one of the most common and entirely avoidable causes of poor outcomes.
Technique: cannula versus needle
The debate between needle and cannula for tear trough is ongoing, and experienced practitioners may use either depending on the patient. My preference, shared by most high-volume injectors in the periorbital area, is a blunt-tipped cannula. The cannula is less likely to pierce blood vessels, distributes product more evenly, and typically results in less bruising and downtime. A practitioner defaulting to a needle because they are unfamiliar with cannula technique is not a safety feature — it is a limitation.
What safe treatment actually looks like
Knowing what to expect from a well-run consultation is one of the most useful things a patient can bring to any appointment. Safe tear trough treatment should include all of the following:
- A thorough consultation covering full medical history, medications, and a careful assessment of your anatomy — not a brief chat immediately before injecting
- An honest discussion of whether you are actually a suitable candidate, with the possibility of being turned away or redirected
- A clear explanation of the specific product being used and why it is appropriate for your anatomy
- Hyaluronidase on-site and immediately available — not something that has to be sourced after the fact
- A practitioner who can recognise the signs of vascular occlusion and has a clear, practised emergency protocol
- A conservative approach — under-treating and reviewing at two weeks is best practice; over-injecting in a single session is not
- Written aftercare instructions and a direct contact number, not just a generic clinic email address
In England, legislation introduced in September 2023 requires that aesthetic filler procedures can only be administered by a prescriber or under the direct supervision of one. This is a meaningful improvement, but it does not guarantee competence. A prescriber can still be undertrained in periorbital anatomy and technique. Professional body membership — BCAM, JCCP, or equivalent — combined with evidence of specific tear trough training and a practitioner who is transparent about their complication management protocols, are far more reliable indicators of safety than a prescribing licence alone.
At Health & Aesthetics, every tear trough consultation begins with an honest assessment of whether treatment is appropriate. A significant proportion of patients I see for this area are advised against filler, or redirected to an alternative approach. That is not a failure of the consultation — it is precisely the point of it.
