Rejuran Under-Eye Pain: Why It Happens and What’s Normal

Rejuran I (the under-eye version of Rejuran) is one of the most popular treatments in Korea for smoothing fine lines, strengthening thin skin, and improving dark circles.
However—many patients are surprised to feel more discomfort under the eyes than in other treatment areas.

So why does Rejuran under the eyes feel more painful, and when is that pain normal or a sign to check with your clinic?

Here’s a clear, simple breakdown.

Why Rejuran Hurts More Under the Eyes

The under-eye area is one of the thinnest, most sensitive regions of the face.
There’s less fat padding, more nerve sensitivity, and little room for swelling.
Because of this, Rejuran injections here naturally feel more intense.

Here are the main reasons:

1. Thin, Delicate Skin

The skin is only about 0.3 mm thick.
Any injection—no matter how gentle—can cause a sharper sensation.

2. More Nerve Endings

Under-eye nerves are closer to the surface.
This makes each injection feel stronger than on the cheeks or forehead.

3. Rejuran’s Viscosity (Thickness)

Rejuran is a thicker, gel-like PN substance, not a watery skin booster.
When injected, it creates more pressure, which can feel like:

• Stinging
• Pressure
• Sharpness
• Heat-like discomfort

This is normal and expected.

4. Multiple Small Injections Are Needed

Under-eye Rejuran is placed using micro-droplet techniques.

This means many tiny injections, often 10–20 per side.
More injections = more sensation.

5. Temporary Swelling & “Bumps”

Right after injection, Rejuran forms small blebs (bumps) under the skin.
These can feel tight or tender for a few hours.

How Much Pain Is Normal?

Normal Pain

• Sharp stinging during injection
• 5–10 minutes of lingering heat or pressure
• Tenderness for a few hours
• Mild soreness the next day

Many describe it as “more painful than fillers, less painful than microneedling RF.”

What’s Not Normal

• Severe throbbing
• Increasing pain after 24 hours
• Spreading redness and warmth
• Pain that feels deep and persistent
• Vision changes (rare emergency symptom)

If any of these occur, follow up with your clinic.

Ways Korean Clinics Reduce Rejuran Under-Eye Pain

Korean dermatologists commonly use:

1. Strong Topical Numbing Cream

Applied 20–30 minutes before treatment.

2. Micro-needle or cannula technique

Cannulas reduce the number of entry points and often reduce pain.

3. Ice packs before and after injection

Helps calm nerves and reduce swelling.

4. Slow, controlled injection speed

Faster injections hurt more; skilled injectors go slowly under the eyes.

5. Vibration anesthesia

A device that distracts the nerves during injection.

How Long Does Under-Eye Rejuran Pain Last?

• Injection pain → immediate but short
• Tenderness → 1–3 hours
• Mild soreness → up to 24 hours
• Small bumps → usually gone within 6–12 hours

Most patients return to normal activities the same day.

Should You Avoid Rejuran If You Have Low Pain Tolerance?

Not necessarily.
Rejuran I gives excellent results for:

• Fine under-eye wrinkles
• Thin skin
• Crepey texture
• Dark circles from dermal thinning

But you should request:

• Extra numbing
• Ice
• Cannula technique
• Breaks between injections

Many patients find these adjustments make the treatment much more tolerable.

Final Thoughts

Rejuran under the eyes is known to be slightly painful, but this is normal and related to the anatomy of the area and the nature of the product.
The pain is quick, manageable, and temporary—and the long-term benefits for under-eye texture and collagen are significant.