Under-eye filler guide: tear trough correction, risks, and realistic expectations

Under-eye filler (tear trough filler) is one of the most requested and most technically demanding filler treatments — and one of the highest-risk areas in all of aesthetic medicine. Here's an honest guide to what it does, who benefits, and the risks providers don't always emphasize upfront.

What is the tear trough?

The tear trough is the groove between the lower eyelid and the cheek. It creates a shadowed, sunken appearance under the eyes — often making patients look tired, older, or more gaunt than they feel. The appearance is caused by:

Volume loss — loss of fat in the periorbital fat compartments and upper cheek
Ligamentous laxity — the orbicularis retaining ligament loosens with age, allowing the area to sink
Skin laxity and pigmentation — thin eyelid skin allows underlying vasculature to show as dark circles

HA filler placed in the tear trough addresses volume-driven hollowing. It does not address all causes of dark circles — vascular dark circles (visible blood vessels through thin skin) and pigmentary dark circles (melanin-driven) are not improved by filler.

Who is a good candidate?

Ideal candidates:

Patients with primarily hollow/volume-loss type under-eye appearance
Patients with good skin quality (not excessive skin laxity)
Patients who can clearly identify the tear trough hollow as their specific concern
Patients who understand this is a very technique-sensitive area

Not ideal candidates:

Patients with malar (cheek) bags or festoons — puffy bags below the eye. Filler can worsen these by adding fluid that migrates into the area.
Patients with significant eyelid skin excess — filler does not address skin laxity
Patients with predominantly vascular dark circles — filler will not help
Patients with edema-prone skin (chronic under-eye puffiness in the morning) — HA filler is hydrophilic and can worsen fluid accumulation
Patients who have had lower blepharoplasty (surgical eyelid procedure) recently — anatomy may be altered; proceed only with a very experienced injector

The highest-risk filler area

The tear trough is consistently ranked by experienced injectors as the highest-risk area for filler placement. Reasons:

Tyndall effect

HA filler placed too superficially under the thin eyelid skin creates a bluish discoloration called the Tyndall effect — light scattering through the filler shows blue under the translucent skin. This can look like a bruise that never resolves. It requires hyaluronidase to dissolve.

Prevention: Use HA products designed for this area (low-viscosity, low water-absorption products like original Restylane, Volbella, or Belotero Balance). Place deep, at the periosteum — not superficially under the skin.

Vascular occlusion risk

The periorbital area has a dense vascular supply closely related to the ophthalmic artery — the artery that supplies the retina. Accidental intravascular injection in this region carries risk of:

Skin necrosis
Vision loss (retinal artery occlusion) — a rare but catastrophic complication

Prevention: Cannula technique (blunt-tipped cannula rather than sharp needle) significantly reduces intravascular injection risk in the periorbital area. Many experienced injectors use cannulas exclusively for tear trough filler.

Asymmetry and overcorrection

The tear trough area has very little margin for error. A subtle asymmetry in placement (0.1–0.2 mL difference side to side) is visible because the eye area is in constant focus when looking at someone. Overcorrection (filling too much) creates a puffy, swollen appearance that can last months.

Products used for tear trough

Not all HA fillers are appropriate for the tear trough:

Preferred:

Restylane (original NASHA): Low water-binding, stays in place, time-tested for under-eyes
Volbella XC: Soft, low G-prime, designed for superficial areas
Belotero Balance: Very low G-prime, integrates well with thin skin — low Tyndall risk

Avoid:

Voluma, Lyft, Radiesse, Sculptra — too firm, too high G-prime, not appropriate for the eyelid area

Technique: needle vs cannula

Cannula: Blunt-tipped flexible tube inserted through a single entry point. Cannot enter vessel walls — significantly lower vascular occlusion risk. Most experienced injectors prefer cannula for tear troughs. Slightly more bruising at the single entry point.

Sharp needle: Allows more precise placement but carries higher intravascular risk. Some injectors use needles for specific anatomical situations.

What to ask: Does your injector routinely use cannula for tear trough? This is the appropriate technique preference for this area.

How much filler is used?

Less than patients typically expect:

Usually 0.5–1.0 mL total across both sides (0.25–0.5 mL per side)
Overcorrection is the most common aesthetic complication — resist the urge for more
The filler must be placed conservatively; it can be added but is difficult to remove evenly

Longevity

Tear trough filler tends to persist longer than expected because it is in an area of minimal movement:

12–18 months is common
Some patients retain results for 2+ years
The low-movement environment reduces filler breakdown

What to expect after treatment

Immediate swelling: Normal; can make results look overfilled initially
Bruising: Common in this area; can take 7–10 days to resolve
Evaluate at 2 weeks: Assess results after swelling resolves; earlier is not reliable
Lumps or unevenness: If present at 2 weeks, small amounts of hyaluronidase can dissolve selectively

When to dissolve

See our filler dissolving guide for full details. For tear trough specifically:

Tyndall effect (blue discoloration) requires hyaluronidase
Overcorrection causing puffiness requires hyaluronidase
Persistent lumpiness at 2–4 weeks requires hyaluronidase

Questions to ask before booking

Do you use cannula technique for tear trough, or needle?
What product do you use in this area and why? (Low G-prime, low water-absorption products are appropriate)
Can you assess whether my dark circles are vascular or hollow-type — and whether filler is appropriate?
Do I have any evidence of malar bags that could worsen with filler?
How often do you perform this specific treatment, and what is your Tyndall rate?

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