Does Rejuran Hurt? A Few Sharp Minutes, Then One to Three Days of Bumps

Does Rejuran hurt enough that you'll regret fitting it into a short Seoul trip?

It does sting, more than most people expect from a skin booster: a few minutes of sharp pinches even after numbing cream, strongest beside the nose, on the forehead and under the eyes. The small bumps it leaves usually settle within one to three days, and that, more than the needle, is what to plan around.

Hello, I'm Dr. Hyunji Kim, Director · Lead Physician at Delphic Clinic in Gangnam, and a member of the Korean Filler Society.

At Delphic, the doctor who examines your skin in the consultation is the doctor who does your injections, so the person you warn about your low pain threshold is the one holding the needle. A medical interpreter for your language comes at no extra charge, and weekday hours run until 21:00, which helps if you're fitting this in after a day of travel.

If needles are the part you dread, send one daylight photo of your bare face and your Seoul dates on WhatsApp, and ask which of your areas tend to be the sharper ones. The 1:1 consultation is free, and with your own photo in the message, the answer you get is about your face rather than Rejuran in general.

Why does Rejuran hurt so much?

Most of the sting comes from what's in the syringe, not from the needle itself. Rejuran is polynucleotide (PN), long DNA chains taken from salmon, and it forms a thick gel. Pushing it through a fine needle is like squeezing honey through a thin straw instead of water: it takes more pressure, and each small deposit stretches the upper layer of skin, where nerve endings sit close to the surface.

It also goes in shallow, at many small points rather than a few deep ones. You feel each point as a short, bright pinch, then a dull pressure as the gel spreads. Thick gel, shallow placement and many points together are the reason it feels sharper than thinner hydrating injections.

Side effects and redness: what to watch for

Published reviews of PN treatments describe the side effects as mostly mild and short-lived: soreness, redness, swelling and small bumps at the injection points. The pain is real but brief, and on its own it isn't a sign that something is going wrong.

Where on the face does it sting most?

Thin skin over bone hurts more than padded cheeks. For most people the forehead, the sides of the nose, the area above the upper lip and the skin under the eyes are the sharpest, while the middle of the cheeks and the jawline are easier. Under-eye skin has its own Rejuran version on our menu, because that skin is thinner than anywhere else on the face.

If you're nervous, start with the easier areas on a first session and decide about the delicate ones once you know how your skin takes it.

What will you see in the mirror over the next three days?

In short, this is the part most people underestimate. The injections are over in minutes; the bumps are what you carry into dinner.

Our menu lists the downtime as about one to three days, and sessions are spaced two to three weeks apart, so a short trip usually fits one session.

Say you're 27, teaching English in Daejeon, with a Friday off and a Sunday train back. Because weekday hours run until 21:00, you could ask for a Friday afternoon appointment, spend Saturday with the bumps at their most visible, and see most of them gone by Monday's first class. What I'd steer you away from is treatment on the morning of a wedding, a work photo or anything where you'd rather not answer questions about your face.

One thing few people are told: skip the jjimjilbang, the sauna and the soju that first night. Heat and alcohol widen blood vessels, which makes bruising and swelling more likely while the injection points are fresh. And don't massage the bumps flat; they settle as the gel spreads.

Bumps, bruises and the rarer problems

Almost everyone gets the bumps, some pinpoint redness and tenderness to the touch for a day or so. Bruises show up for some people, more often around the eyes and more often if you take a blood thinner or drank the night before.

Less commonly, a bruise lasts about a week, or one small firm spot takes longer than the rest to flatten. These usually fade without treatment. How strong any of these reactions is varies from person to person, and thin, sensitive skin tends to show more.

The rare problems are infection and allergic reaction, and their signs look different from normal bumps: a spot that gets hotter, redder or more painful after day two instead of better, pus, spreading redness, or fever. Swollen lips or throat, or hives soon after treatment, need urgent care wherever you are.

If any of that appears after you've flown home, see a local doctor the same day rather than waiting it out, and bring the product name, the volume and the treatment date. Ask for those three details before you leave Seoul and keep a photo of them on your phone. It's also worth sending a photo of the area on WhatsApp to the clinic that treated you.

If you take a blood thinner, have a fish or seafood allergy, or had a laser or peel in the last few weeks, put that in your first WhatsApp message along with the area you want treated. Those are the details that decide whether this trip is the right time, and it's better to know before you plan a day around it.

Who should skip Rejuran for now

• An active acne flare, cold sore or any infection where the injections would go.
• A known allergy to salmon, fish or anything in the product, since PN comes from salmon.
• Pregnancy or breastfeeding.
• A current course of isotretinoin, or a laser, peel or other injectable in the same area within the last few weeks.
• A history of keloids or thick raised scars.
• A prescribed blood thinner: don't stop it on your own; tell the doctor so the plan allows for bruising.

Rejuran also isn't the right tool for some worries. A booster won't lift a sagging jawline. For deep, rolling acne scars, Rejuran by itself rarely does enough, which I covered in what Rejuran S can and can't do for depressed acne scars.

Can you make it hurt less?

How much does Rejuran hurt on the day depends less on your pain tolerance than on three choices made before the first needle.

Numbing cream is the usual first step, and it needs time on the skin to work. Arrive on time, and ask how long the cream stays on so you're not starting on half-numb skin.

The product matters too. Our menu has a comfort-focused Rejuran line, and I explained how Rejuran HB differs from that comfort-focused line in a separate post.

Then there's the map. Fewer, easier areas on a first session make the whole thing shorter. During the injections, say so if one spot is too sharp; a short pause between areas costs nothing.

Does a more comfortable option change the cost?

It can, along with a few other things:

• which Rejuran product you choose, including the under-eye version and the comfort-focused line
• how many cc go in and over how many areas
• how many sessions you plan, two to three weeks apart
• whether it's part of a one-day package that pairs Rejuran with another booster

Korean and foreign patients pay the same menu price here, and the treatment list is on Delphic Clinic's English site. I've also written about what moves the price of Rejuran in Korea and how Rejuran Healer pricing works by volume. For your own figure, ask on WhatsApp with a photo of the areas you have in mind, and ask in the same message how the deposit and payment would work for your dates, since both are settled after the consultation.

What to ask any clinic before the first injection

Put simply, it doesn't have to be us. Wherever you book, these questions tell you more than a price list does:

• Is the doctor I consult with the one who injects me?
• How long does the numbing cream stay on, and can I have longer if I'm nervous?
• Which product, how many cc and which areas, and can I have that in writing before I leave?
• If a spot gets hot or painful after I fly home, what should I do and how do I reach you?
• Is an interpreter in the room during the injections, not only at the consultation?
• Is the price the same for foreign patients?

Where I stand on the sting

I don't think anyone should talk you out of being nervous about this. It does hurt, briefly, and the people who handle it most easily are the ones who knew that going in and kept the next day quiet. If the timing on this trip is wrong, Rejuran will still be on the menu next time, and there's nothing gained by rushing it.

What decides how much it stings for you is how thin the skin is where the gel goes, more than how brave you are. The 1:1 consultation is free, a medical interpreter is there at no extra charge, and we're at 476 Gangnam-daero, Urban Hive Bldg 2F, connected to Exit 3 of Sinnonhyeon Station, open Mon–Fri 10:30–21:00 and Sat 10:30–17:00. When you're ready, send a bare-face photo and your Seoul dates on WhatsApp, with the one question about your own situation that's on your mind, whether it's the under-eyes, the bumps before a flight or a medication you take.

— Dr. Hyunji Kim, Director · Lead Physician