The Tyndall Effect and Under-Eye Circles: Causes and Correction

Illustration: frontal close-up of the eyes of a fictional woman with blonde hair and blue eyes, with a slight blue-grey tint under the eyes, as seen with the Tyndall effect.

The Tyndall Effect Under the Eyes: Causes, Prevention and Correction

A few days after a hyaluronic acid injection under your eyes, you notice a bluish shadow in the mirror that does not go away, sometimes with a slight bump. Or you are considering this injection for your under-eye circles and have read that it can leave a blue tint.

In aesthetic medicine, this tint has a name: the Tyndall effect. It comes from hyaluronic acid gel placed too close to the surface, which happens more easily where the skin is thin, such as under the eyes. The risk can be reduced before the injection, and discolouration that has already developed can be corrected. Unusual pain, a change in vision or skin that turns white, grey or blue near the injection site can signal a blood vessel complication and require immediate care.

In Brief

Five things to know before deciding

What it is: a bluish tint visible in the skin after a hyaluronic acid injection, when the gel has been placed too close to the surface; under the eyes, it appears as a bluish shadow where the injection was given.
Why: gel placed too superficially or deposited in a large amount in one spot, under thin skin; the explanation based on light is debated, and appearance alone is not enough to make a diagnosis.
Prevention: an assessment of the skin and a technique that avoids placing the gel too superficially; these reduce the risk without eliminating it.
If it appears: have it assessed by the person who injected you; you can also ask your questions during a Global Aesthetic consultation at CARE MD; a prescription treatment that dissolves the gel can correct it, although neither the timing nor the result is guaranteed.
Right away: unusual pain, a change in vision, skin that turns white, grey or blue near the injection site, or signs of infection require immediate care.

What Is the Tyndall Effect in Aesthetic Medicine?

The term refers to the bluish tint visible in the skin when a hyaluronic acid gel, a type of filler, has been placed too close to the surface. The name describes what you see; it is not a diagnosis. An in-person assessment is needed to confirm the cause of the discolouration.

In the context of under-eye circles, the Tyndall effect takes the form of a bluish shadow under the eye, where the gel was injected; this is also where this discolouration is most typically seen.

The name comes from physics, where it refers to the scattering of light by certain particles; here, the Tyndall effect refers to skin discolouration after an injection, not the sign observed during an eye examination.

Why Does It Appear After an Under-Eye Injection?

It all comes down to where the gel is located. When it is placed too close to the surface, or deposited in a large amount in one spot, the skin covering it takes on a bluish tint. This placement depends on the technique, and the skin matters too: discolouration is more likely where the skin is thin, such as under the eyes.

Why blue? The traditional explanation involves light: depending on its colour, light scatters to different degrees when it encounters small particles, and blue is thought to be the colour mainly seen. This explanation is debated. Injected gel is a complex material that these scattering models do not describe well. This physical phenomenon is unlikely to explain, on its own, the tint of the skin.

Another possible explanation is anatomical: the composition of the tissues under the skin may contribute to the tint seen in the same place in some people. This hypothesis cannot explain your discolouration based on its appearance. To decide on the next steps, the assessment includes checking, among other things, where the gel is located.

What Does It Look Like, and How Can You Tell It Apart From a Bruise or an Under-Eye Bag?

The tint is bluish and visible in the skin where the gel was placed. The area often has a slight bump or small irregularities, because the gel is close to the surface. The discolouration may be visible as soon as the injection is finished or appear only after a few days; without correction, it can last for months or even years.

It can look like a faint but deep bruise, which can be confusing in the days following the injection. Most hyaluronic acid filler side effects, such as swelling and bruising, occur shortly after the injection, and many go away within a few days to a few weeks. A bag or swelling under the eyes after a hyaluronic acid injection is therefore not, in itself, the Tyndall effect: it is a different change, which needs to be assessed in its own right. Some effects also appear later: weeks, months or even years after the injection.

A bluish under-eye circle that you already had before the injection is not the Tyndall effect either, since the Tyndall effect comes from the gel; in that case, dark circle treatment starts with what gives the circle its colour or its hollow appearance.

None of these signs is enough to make a diagnosis: appearance alone does not distinguish discolouration caused by the gel from another complication. When the tint appeared, how it has changed and the symptoms that accompany it guide the assessment.

How Often Is It Seen?

The Tyndall effect is a known complication of hyaluronic acid injections under the eyes, which occurs only in some people. A percentage observed for a product or technique cannot predict your own risk. The risk varies with what happens at the time of the injection: the depth at which the gel is placed, the amount deposited in one spot and how thin the skin is.

Before the injection, ask what may increase the risk in your case and which precautions are appropriate for your skin.

How Can You Reduce the Risk Before an Under-Eye Injection?

If you are considering a hyaluronic acid injection under the eyes, prevention begins before the injection. The first step in the assessment is to check whether a gel addresses what you want to change; the assessment may show that another approach suits you better. The thickness of your skin is also assessed, and the injection plan is adapted to what the examination shows.

Next comes technique, the primary way to prevent this discolouration. The principle is not to place the gel too close to the surface, nor to deposit a large amount in one spot. The person performing the injection decides on the depth, the amount and how to distribute the gel, based on your anatomy.

That is why the choice of this person matters. Choose a healthcare professional who is experienced with these injections, and before you decide, ask them which risks apply to your situation, what would happen if discolouration appeared and how it would be corrected. A careful assessment and meticulous technique reduce the risk; they do not eliminate it.

What Should You Do If Discolouration Appears?

After a hyaluronic acid injection for under-eye circles, a bluish shadow quickly makes you think that the injection has gone wrong. Yet what you see can have several causes: a bluish tint caused by the gel, a bruise and swelling do not have the same cause or the same course. The first step is therefore to have the discolouration assessed, without assuming what caused it.

When the doctor concludes during the assessment that hyaluronic acid gel has been placed too superficially, correction is possible: a prescription treatment that dissolves the gel. Its aim is to break down the overly superficial gel in that area so that the tint fades. This treatment is injected by a doctor, or by a nurse injector supervised by a doctor.

A decision is first made with you: whether to dissolve all of the gel, or only the part that is discolouring the skin. If the gel had been placed for under-eye hollows, dissolving it can mean losing some of the volume achieved, and the original hollow can become visible again.

Waiting is another possibility, once a blood vessel complication or an infection has been ruled out. Some fillers break down over time, but that rate does not tell you when the tint will go away: without correction, it can last for months or even years. The decision to wait is therefore made with the person assessing you, with this uncertainty in mind.

Certain laser treatments have also been tried to fade this discolouration, but they are not an established solution.

Result: Improvement can be quick, but a second session is sometimes needed; neither the timing nor the result is guaranteed.
Risk: This treatment can cause an allergic reaction. Such reactions are uncommon in aesthetic medicine, and your allergies are discussed beforehand.
Follow-up: The doctor then checks the tint to make sure it is fading; if the correction is not enough, referral to a professional with more experience managing these complications may be needed.

Who Assesses the Discolouration, and What Happens During the Consultation?

Discolouration under the eyes needs to be assessed in person: neither a photo nor the mirror is enough to establish its cause. You can ask your questions about this discolouration during a Global Aesthetic consultation at CARE MD in Sainte-Thérèse. During the assessment, the doctor determines what needs to be examined and whether a referral is needed. You can also learn about CARE MD's professionals before your appointment.

To make the discussion useful, prepare the following information:

what led you to have the injection in the first place: hollowing, discolouration or both;
the date of the injection, what has changed since then and, if you know it, the type of product injected;
your previous aesthetic treatments, including other injections or implants;
your health problems and allergies;
all your medications, including those sold without a prescription, as well as your vitamins, minerals and natural products.

The assessment does not necessarily lead to a correction. The doctor may conclude that a prescription treatment that dissolves the gel can be considered, that it is better to monitor the tint, that another approach is more appropriate, or that a professional with more experience in these complications should take over. Inflamed or infected skin also means that any new filler injection is postponed until the skin has been treated.

Seek Care Right Away

During or after an injection near the eye, including in the following days, these signs are not simply discolouration:

unusual pain;
a change in vision;
skin that turns white, grey or blue near the injection site;
signs of infection: an area that is red, swollen, painful and warm, sometimes with fever.

Seek care right away

These signs require immediate medical care. Call the person who performed the injection or go to the emergency department, instead of using a form.

A stable bluish tint that does not hurt does not look the same as skin that turns white, grey or blue near the injection site, even without pain: the latter can signal a blood vessel blocked by the gel. You do not have to sort this out yourself. If you are at all unsure, seek immediate care.

Ask Us About the Tyndall Effect

Do you have a question about discolouration that appeared after an under-eye injection, or about what you should know before having one? Write to us. Your message is no substitute for medical care: unusual pain, a change in vision, white, grey or blue skin near the injection site, or signs of infection require immediate medical care.

Frequently Asked Questions

What is the Tyndall effect?

In aesthetic medicine, the Tyndall effect is a bluish tint visible in the skin after a hyaluronic acid injection, when the gel has been placed too close to the surface. It is typically seen under the eyes, where it can look like a bruise, often with a slight bump. The name describes an appearance: the cause of discolouration is confirmed during an in-person assessment.

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