Rejuran for Under Eyes: Benefits, Results & Downtime

September 11, 2026

Rejuran for under eyes, commonly known as Rejuran I or Rejuran Eye, is a polynucleotide (PN) injectable designed specifically for the thin and delicate skin around the eyes. Unlike traditional dermal fillers, it is primarily intended to improve skin quality, elasticity, hydration, and fine lines rather than simply adding volume.

In Korea, Rejuran I is frequently considered for patients concerned about thin-looking under-eye skin, crepey texture, fine lines, and early signs of aging. Results develop gradually, and several treatments may be recommended for cumulative improvement.

What Is Rejuran for Under Eyes?

Rejuran I uses polynucleotides derived from purified salmon DNA and is formulated for delicate areas such as the under-eye region. Its lower-viscosity formulation is designed to be suitable for thinner skin compared with formulations intended for broader facial treatment.

The treatment may be considered for:

Under-eye fine lines
Crow's feet
Thin or fragile-looking skin
Crepey texture
Reduced elasticity
Dehydrated-looking skin
Early signs of under-eye aging
Overall improvement in under-eye skin quality

The objective is to improve the condition of the skin itself rather than create the filling or volumizing effect associated with an under-eye filler.

What Are the Benefits of Under-Eye Rejuran?

Rejuran I is primarily focused on gradual skin-quality improvement.

Potential benefits include:

Improved skin elasticity: May help the under-eye area appear firmer and more resilient.
Smoother fine lines: Gradual skin remodeling may soften the appearance of superficial lines.
Better hydration: PN treatment may improve the appearance of dry or dehydrated skin.
Improved texture: Crepey or uneven-looking skin may appear smoother.
Healthier-looking skin: The under-eye area can appear more refreshed as overall skin quality improves.
Subtle rejuvenation: The treatment does not typically create an obvious change in facial volume or shape.

The degree of improvement varies depending on age, skin condition, treatment technique, and individual response.

Who Is a Good Candidate for Rejuran Under Eyes?

Rejuran I may be appropriate for patients whose under-eye concerns are primarily related to skin quality.

It may be considered if you have:

Fine lines under the eyes
Early crow's feet
Thin-looking under-eye skin
Crepey texture
Reduced elasticity
Dry or dehydrated under-eye skin
Early signs of aging

It is less suitable as a standalone treatment when the primary problem is structural rather than superficial.

For example, a deep tear trough caused by volume loss or prominent under-eye fat cannot necessarily be corrected simply by improving skin quality.

Can Rejuran Treat Dark Circles?

Rejuran may improve the appearance of some dark circles when they are associated with thin skin, poor skin quality, or visible underlying structures.

However, dark circles have many different causes.

They may be related to:

Skin pigmentation
Visible blood vessels
Thin translucent skin
Tear-trough shadowing
Under-eye hollowness
Prominent fat pads
Genetics
Allergies or rubbing

Rejuran is not a universal dark-circle treatment. If the darkness is primarily caused by pigmentation, deep hollowness, or prominent fat, a different treatment approach may be more appropriate.

A proper assessment is therefore important before choosing Rejuran specifically for dark circles.

What Is the Rejuran Under-Eye Treatment Process?

A typical Rejuran I treatment in Korea may involve several steps.

1. Skin Assessment

The provider evaluates the under-eye skin, fine lines, elasticity, pigmentation, hollowness, and overall anatomy.

2. Preparation and Numbing

The treatment area is cleansed, and topical numbing cream may be applied to improve comfort.

3. Rejuran I Injections

The PN product is delivered through multiple small injections into the superficial skin around the treatment area. The exact injection pattern, depth, and amount should be individualized.

4. Immediate Post-Treatment Check

Small raised bumps, redness, or mild swelling can appear at the injection sites immediately afterward.

Because the eye area is anatomically delicate, Rejuran I should be administered by a qualified medical professional experienced with periocular injections.

Is Rejuran Under Eyes Painful?

Some discomfort is expected because Rejuran I involves multiple small injections around a highly sensitive area.

Patients may experience:

Stinging
Pinching sensations
Pressure
Temporary tenderness

Topical numbing can make the procedure more comfortable. The actual injection period is generally relatively short, although the overall appointment takes longer when preparation and numbing are included.

Pain varies according to individual sensitivity, injection technique, and the number of injection points.

What Is the Downtime After Under-Eye Rejuran?

Rejuran I generally has minimal downtime, but the under-eye area can show temporary injection marks more clearly because the skin is thin and prone to swelling and bruising.

Common short-term effects include:

Small raised injection bumps
Mild swelling or puffiness
Redness
Pinpoint bruising
Tenderness
Temporary sensitivity

For many patients, the small injection bumps become much less noticeable within 1–3 days, although bruising can take longer to disappear.

If you have an important event, photoshoot, or professional appointment, allowing several days of flexibility is advisable.

When Can You See Rejuran Under-Eye Results?

Rejuran is not designed to produce an immediate dramatic transformation. Improvements generally develop gradually as the skin responds to treatment.

A general timeline may look like:

Immediately: Small bumps, redness, or swelling may be visible.
1–3 days: Injection-related swelling and bumps generally begin to settle.
2–4 weeks: Early improvements in hydration, texture, and fine-line appearance may become noticeable.
1–3 months: More developed improvements in skin quality and elasticity may appear.
After multiple sessions: Results can become more noticeable as the effects accumulate.

Clinical observations of periorbital PN treatment have reported progressive improvements over follow-up, with more noticeable results developing over several months.

Individual results can vary considerably, so the timeline should be considered a general guide rather than a guarantee.

How Many Rejuran Under-Eye Treatments Do You Need?

A single session may produce some improvement, but Rejuran I is commonly performed as a series of treatments when the goal is more comprehensive skin-quality improvement.

A Korean treatment plan may involve:

Around 3 initial sessions
Approximately 3–4 weeks between sessions
Individualized maintenance afterward

The exact number depends on:

Degree of fine lines
Skin thickness
Elasticity
Age
Treatment goals
Previous treatments
Individual response

The under-eye area may also require a more conservative approach because of its delicate anatomy.

How Long Do Rejuran Under-Eye Results Last?

Results are not permanent because the skin continues to age naturally.

How long the improvement remains noticeable depends on:

Age
Skin condition
Lifestyle
Sun exposure
Number of treatment sessions
Individual collagen response
Maintenance schedule

After an initial series, some patients may choose periodic maintenance treatments when the improvement begins to decline.

Rather than following the same schedule for everyone, maintenance should be based on how the under-eye skin actually changes over time.

Rejuran I vs Under-Eye Filler

Rejuran I and under-eye filler address different concerns.

Rejuran I

Focuses on skin quality
Improves elasticity and texture
May soften superficial fine lines
Provides gradual rejuvenation
Does not primarily add volume

Under-Eye Filler

Primarily adds volume
Can address selected forms of tear-trough hollowing
Produces a more immediate contour change
Requires careful assessment because the under-eye area is anatomically complex

If your main concern is thin, crepey, or finely lined skin, Rejuran I may be more appropriate.

If your main concern is a true volume deficit or pronounced tear trough, another treatment may be more suitable.

In some cases, different treatments can be used as part of a broader plan, but they should not be considered interchangeable.

What Should Foreigners Know Before Getting Rejuran Under Eyes in Korea?

Rejuran I is particularly popular among international patients visiting Seoul for Korean aesthetic treatments. However, the under-eye area requires more careful treatment planning than many other facial areas.

Before booking, international patients should confirm:

The product is genuine Rejuran I/Rejuran Eye.
The provider is qualified to perform periocular injections.
The exact treatment volume is clearly stated.
Numbing and aftercare are included or clearly priced.
The clinic explains expected swelling and bruising.
English or another preferred language is available if needed.
The clinic provides clear post-treatment instructions.

If you have limited time in Korea, avoid scheduling treatment immediately before an important event because temporary swelling or bruising can be visible.

Final Thoughts

Rejuran for under eyes is primarily a skin-quality treatment, not a conventional filler. Rejuran I is specifically formulated for delicate areas around the eyes and may help improve fine lines, elasticity, hydration, and crepey-looking skin over time.

Most patients should expect temporary injection bumps, mild swelling, redness, or occasional bruising rather than significant downtime. These effects commonly settle within several days, while the actual skin-quality improvements develop gradually over the following weeks and months.

Rejuran I may be a good option when the main problem is thin, aging, dry, or finely lined under-eye skin. However, significant hollowness, prominent fat pads, pigmentation, or vascular dark circles may require a different treatment strategy.

For the best results, the treatment should be customized to the specific cause of your under-eye concern and performed by a qualified provider experienced with delicate periocular injections.

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