In short. The tear trough is the groove from the inner corner of the eye toward the cheek. When it hollows, the shadow reads as tiredness. A dissolvable gel filler can soften true hollowing, but the under-eye is technically demanding: thin skin, unforgiving anatomy, and overfilling looks worse than no treatment. Only true hollowing responds; pigment, thin skin, and fluid puffiness do not.
Key points
- Assess sitting upright in good light before deciding.
- True hollowing is a fixed groove; festoons are fluid and lax tissue.
- Place small amounts deep, and deliberately undercorrect.
- Review at two to four weeks; adding is easier than removing.
- Vascular occlusion is rare but serious; dissolving must be available.
What is the tear trough?
It is the groove running from the inner corner of the eye toward the cheek. When volume is lost here, the hollow casts a shadow that reads as tiredness. A dissolvable gel filler can soften this hollow in selected patients, but the under-eye is among the most demanding areas to treat.
Is the darkness a hollow, pigment, or puffiness?
| True hollowing | Pigmentation | Festoon / malar bag | |
|---|---|---|---|
| Cause | Volume deficit | Melanin | Fluid and lax tissue |
| Appearance | Fixed groove, shadow | Brown or grey colour | Soft swelling |
| Responds to filler | Yes | No | No; may worsen |
| Better approach | Small-volume support | Pigment treatment | Skin or surgical assessment |
Why does the distinction matter?
Only one of these responds to filler. Under-eye darkness has several causes: true hollowing, pigmentation, thin skin showing muscle beneath, and fluid-related puffiness. Festoons and malar bags are swellings of the upper cheek caused by fluid and lax tissue — adding filler near them can make puffiness worse. Some patients have both, and honest assessment sometimes means filler is not the right tool.
How is it treated?
A soft, low-density gel is placed in small amounts, usually deep near the bone rather than directly under the thin skin, to lift the hollow without visible lumps. Many practitioners use a blunt cannula rather than a needle, which can reduce bruising and allows smooth placement along the groove. We deliberately undercorrect, place very small amounts deep, and review at two to four weeks. Adding a little more at a second session is safe and simple; removing excess is harder and less precise.
What is recovery like?
Swelling is common and can mimic overfilling for several days. Bruising may last one to two weeks. The true result is judged only after everything settles, usually at the two-week review. Sleeping slightly elevated and avoiding rubbing the area helps in the first days.
What are the specific risks?
Beyond usual swelling and bruising: prolonged puffiness if product is placed too superficially, visible lumps, and a bluish tint (Tyndall effect) when gel sits too close to the surface. Vascular occlusion is rare but serious, and the practitioner should have the dissolving enzyme and emergency protocols immediately to hand.
When is urgent review needed?
- Severe pain, skin blanching, or a mottled net-like discoloration.
- Any visual change, blurred or double vision.
- Swelling that keeps increasing beyond the first days, or one eye markedly different.
Sources
Internal links
Frequently asked questions
Why is the under-eye considered a difficult area for filler?
The skin is very thin, the anatomy is unforgiving, and overfilling looks worse than no treatment at all. Results are temporary, typically around nine to eighteen months, and prolonged puffiness or visible lumps are specific risks of this region.
Will filler help dark circles under my eyes?
Only if the darkness is caused by true hollowing. Pigmentation, thin skin showing muscle beneath, and fluid-related puffiness are different problems that respond to other treatments. Assessment in good light, sitting upright, is needed to tell them apart.
What are festoons and why do they matter?
Festoons and malar bags are swellings of the upper cheek caused by fluid and lax tissue. Adding filler near them can make puffiness worse. Some patients have both festoons and true hollowing, and honest assessment sometimes means being told filler is not suitable.
Risks & Limitations
- Vascular occlusion — a time-critical emergency in which filler blocks a blood vessel. It can cause skin loss and, rarely, blindness.
- Nodules, lumps or granuloma formation, which may need treatment or dissolution.
- Infection at the injection site.
- Asymmetry or over-correction; over-treatment is harder to correct than under-treatment.
- Migration of filler away from the intended area.
- Temporary brow or eyelid droop after botulinum toxin, which resolves as the effect wears off.
- Bruising and swelling. All injectable results are temporary and maintenance is required.
When to Seek Care
- Severe pain out of proportion to the procedure, or skin turning white, grey, mottled or dusky — this is a vascular emergency; seek care immediately.
- Any change in vision — seek emergency care immediately.
- Fever, spreading redness, warmth or pus at an injection site.
- A hard, painful lump that is growing.
- Drooping eyelid, difficulty swallowing, or difficulty breathing after botulinum toxin.
References & Further Reading
- American Academy of Dermatology (AAD) — injectable safety information
- American Society of Plastic Surgeons (ASPS) — injectable guidance
- U.S. Food and Drug Administration (FDA) — approved filler and neurotoxin products
- National Medical Products Administration (NMPA, China) — approved product status
This page is patient education, not medical advice, and it does not cite individual studies. Discuss your own case with a qualified clinician. To arrange an assessment at Chongqing West District Hospital, see Contact & Consultation.