Tear Trough Filler: When Yes and When No

Anatomy of the Under-Eye Area

What people call "dark circles" or "hollows under the eyes" is usually a combination of several processes occurring in parallel. To decide whether filler is the right solution, the underlying mechanisms need to be understood:

• Volume loss — with age, the suborbicularis oculi fat (SOOF) pad is absorbed and descends. This creates a hollow that wasn't there before. In this case filler can help — because the problem is a lack of volume.
• Thin, translucent skin — when the skin thins, the blood vessels beneath it become visible. This creates a dark-purple color. Filler will not solve this — it may worsen it because it adds a layer visible through the skin (Tyndall effect).
• Hyperpigmentation — darkness from excess melanin, not from blood vessels. More common in darker skin tones. Filler is not relevant here.
• Fat pads (malar bags / festoons) — bulges formed by herniation of fat through the septum. Filler can worsen them — adding volume to an area that is already protruding.
• Lymphatic swelling — fluid retention that worsens in the morning. HA filler actually attracts water and can increase swelling.

In most patients, the issue is a combination of several mechanisms. The physician's role is to identify what is dominant — and to tailor the approach accordingly.

Why This Is a High-Risk Area

The tear trough area is classified as a high-risk area for injection, and for good reason. There are several anatomical reasons:

• Very thin skin — only 0.5 mm, compared to 2–3 mm in the cheek. Any imprecision is visible. Lumps, irregularity, and a bluish color (Tyndall effect) stand out immediately.
• Complex vascular supply — the angular artery runs very close to the injection area. Vascular occlusion can cause tissue necrosis. In severe cases, if material reaches the ophthalmic artery — there is a risk of visual loss.
• Closed compartment — the area is bounded by the orbital rim and the orbicularis retaining ligament. Filler injected there does not "diffuse" — it stays, and if it is in the wrong place, it stays there.
• Tendency to swelling — HA attracts water. In an area that already tends toward swelling, this can create the appearance of chronic "bags" that weren't there before.

When Tear Trough Filler Is Appropriate

There is one scenario in which filler in this area consistently delivers a good result: when the main problem is volume loss — a genuine hollow formed by fat atrophy and bone resorption.

Criteria for a good candidate:

• A clear hollow that developed in adulthood (not darkness that existed from childhood)
• Reasonable skin quality — not too thin, not too translucent
• No prominent fat pads
• No tendency to significant morning swelling
• Light-to-medium skin tone (in very dark skin tones, the risk of Tyndall is lower but the risk of post-inflammatory hyperpigmentation rises)
• Realistic expectations — filler improves, it does not erase

Product Selection

For this area we use light HA, with low crosslinking and low viscosity. A product that is too heavy will create lumps and a Tyndall effect. The goal is a subtle correction — not a full fill. Small amounts (0.2–0.5 ml per side) are the norm. Using a cannula (rather than a needle) reduces the risk of vascular injury and the likelihood of bruising.

When Filler Is Not the Solution

In more than half of cases where patients present with a complaint about "dark circles," filler is not the right solution. Here are the alternatives:

The most common case is actually the last row — a combination of a hollow with skin that is not high enough quality. Our approach in these cases is to address skin quality first: a series of polynucleotides or PRF under the eyes, wait 2–3 months, and only then reassess whether filler is needed. Sometimes, after improving skin quality, the hollow already appears far less prominent.

The Tyndall Effect — What It Is and How to Prevent It

The Tyndall effect is the appearance of a bluish-grey tint beneath the skin, caused when HA is injected too superficially. The mechanism is physical: the gel particles scatter light at short wavelengths (blue), exactly the way the sky is blue due to atmospheric light scattering.

In the under-eye area, the risk is particularly high because:

• The skin is thin enough that HA injected even at a reasonable depth is still too close to the surface
• The bluish color worsens exactly what the patient tried to correct — darkness under the eyes
• HA in this area is absorbed slowly (minimal movement), so the problem persists for months

Prevention: injection at sufficient depth (supraperiosteal — on bone), small amounts, an appropriate product, and use of a cannula. If it has already happened — the solution is dissolution with hyaluronidase.

Alternatives to Filler in the Eye Area

The regenerative approach offers tools that are sometimes more appropriate than filler for this area:

• Polynucleotides (PN) — improve skin texture, thicken it, and reduce translucency. They do not add significant volume, but improved skin quality can reduce the need for filler. Particularly suitable when the main issue is thin skin.
• PRF (platelet-rich fibrin) — growth factors that improve healing and skin thickening. Advantage: it is an autologous material (from the patient's own body), so there is no risk of allergic reaction or Tyndall effect.
• Combining approaches — sometimes the best approach is a series of PN or PRF to improve skin quality, followed — if a significant hollow still remains — by a small amount of filler used cautiously.

This approach requires more patience — a 3–4 month process rather than an "immediate fix." But the result is usually more natural and with less risk of complications.

Frequently Asked Questions