Home›Glossary›Tyndall effect: Meaning in Aesthetic Medicine
Tyndall effect: what it means after filler
Medically reviewed by Dr Sin Yong · Last reviewed · 4 min read
Published 9 October 2026 · Reviewed by Dr Sin Yong
In aesthetic medicine, the Tyndall effect is a bluish or grey tint seen when hyaluronic acid filler sits too close to thin skin, most often under the eye. The tint is usually explained as the clear gel scattering shorter, bluer wavelengths of light back towards the viewer, though the exact optics are debated. It is named after the nineteenth-century physicist John Tyndall, who described the scattering, and it is usually corrected by dissolving the superficial filler.
Key facts
Seen
Most often under the eye after tear trough filler
Cause
Hyaluronic acid placed too superficially
How often
3.3% of 1,452 tear trough treatments in one large series (Wilde 2023)
Correction
Targeted hyaluronidase to the superficial deposit
Superficial filler under thin eyelid skin produces the bluish tint. Schematic, not to scale.
Usually not in any useful timeframe. Hyaluronic acid sitting too close to thin skin keeps showing through for as long as the gel remains, which is why the tint can persist for months rather than fading like a bruise. Because the cause is hyaluronic acid, it can be corrected by dissolving the superficial deposit with hyaluronidase after a test dose, ideally guided by ultrasound so that deeper filler is left alone.
The main factors are depth and volume. Cadaver work on the tear trough supports placing product deeper than the superficial planes, and placing small amounts reduces the chance of gel sitting where light can reach it. Some eyes, particularly with very thin skin or fluid-prone cheeks, are better not treated with filler at all, and saying so at consultation is part of prevention.
A bluish tint from hyaluronic acid sitting too close to thin skin, usually under the eye. It is corrected by dissolving the superficial filler with hyaluronidase.
References
Hirsch RJ, Narurkar V, Carruthers J. Management of injected hyaluronic acid induced Tyndall effects. Lasers Surg Med. 2006;38(3):202-204. doi:10.1002/lsm.20283. source
Wilde CL, Gupta A, Lee S, Ezra DG. Tear trough filler using the three-point tangent technique: lessons from 1452 tear trough applications. Plast Reconstr Surg Glob Open. 2023;11:e5060. doi:10.1097/GOX.0000000000005060. source
Management of Tyndall Effect. Journal of Clinical and Aesthetic Dermatology (PMC), 2016. pmc.ncbi.nlm.nih.gov
Guideline for the Safe Use of Hyaluronidase in Aesthetic Medicine. PubMed. pubmed.ncbi.nlm.nih.gov
Delayed Complications following Dermal Filler for Tear Trough Augmentation: A Systematic Review. Facial Plastic Surgery (PubMed). pubmed.ncbi.nlm.nih.gov
Where the Tyndall effect matters on this site
The Tyndall effect is a placement problem, so it appears on every page that discusses under-eye filler and its correction. The pages below explain how it is recognised, how it is dissolved, and how it is avoided in the first place.
Dark eye circles treatment: the pigment, vascular and hollow types, and why filler does not treat the first two.
Filler correction: the wider service for dissolving, managing or waiting when filler is in the wrong place.
On each of those pages the same principle applies: under the eye, the depth at which hyaluronic acid sits decides whether it shows.
Not to be confused with
A bluish or grey shade under the eye has several possible causes, and they are treated differently.
A bruise. Changes colour and fades. The Tyndall effect appears after filler, can persist for months and often sits over a slight ridge.
Dark circles. Pigment or visible vessels that were present before any filler and are not raised. They are covered on the eye bags, dark circles or tear trough self-check.
Malar oedema. Fluid swelling in the upper cheek, often worse in the morning. It may follow filler too, but it is a swelling, not a tint.
A filler nodule. A palpable lump that may or may not be visible. A Tyndall area can have a soft, bead-like edge, but the tint is the defining sign.
Non-HA material. The Tyndall effect is described with hyaluronic acid. With CaHA or PCL the typical under-eye problem is a firm lump instead, and hyaluronidase does not dissolve it.
A doctor can usually tell these apart on examination, and ultrasound shows superficial gel directly.
What decides whether the Tyndall effect matters for you
If you have had under-eye filler and see a tint, these are the questions that shape what happens next.
What was injected. The Tyndall effect is a hyaluronic acid problem, and hyaluronic acid can be dissolved. If the product is unknown, ultrasound shows what it is likely made of.
How superficial it is, and how many pockets. Dr Sin Yong examines the eye at rest and in expression and images the gel, so that only the superficial deposit is dissolved.
Allergy history. A small test dose of hyaluronidase comes first, as published guidance recommends.
Whether to refill. Any further filler, and at what depth, is a separate decision made once swelling has settled. Some eyes are better not refilled.
What else is going on. Pigment, vessels or a true eye bag will remain after the gel is dissolved, and are planned for separately.
Urgent signs after filler are not a Tyndall question: pale, dusky or mottled skin, or pain that is getting worse, needs urgent assessment by the doctor who injected you, or at A&E, now, and any change in vision or eye pain means calling 995 now.
