When Will Rejuran Show Results? Day 1, Week 4 and Month 3

Rejuran how long to see results: if the injections happen on day two of a five-day trip to Seoul, will your skin look any different by the time you board the flight home?

For most people, only a little. The small bumps usually flatten within a day and the skin can look more hydrated during the first week, but the finer texture and firmer bounce people come for build over roughly four to eight weeks, and show most clearly after two or three sessions spaced a few weeks apart.

Hello, I'm Dr. Hongseok Kim, a board-certified dermatologist with 21 years of experience and the Medical Director of VOS Dermatology Clinic in Gangnam.

I do the consultation and the injections myself, and VOS recorded more than 50,000 cases between January 2023 and April 2026. Rejuran goes into the dermis, the layer where skin rebuilds its own support, so it follows the skin's repair clock, whatever your itinerary says. If you'd rather not talk any of this through in English, a medical interpreter for your language is provided at no extra charge.

If your flights are already booked, send the dates on WhatsApp with one photo of your cheeks taken next to a window in daylight, and ask which day of your stay leaves the bumps the most time to settle. The consultation on WhatsApp is free, and you can ask before you book anything.

What happens in the first 48 hours?

The first thing you'll see in the mirror is a grid of small raised bumps where the needle went in, a bit like neat rows of mosquito bites. That's the injected liquid sitting in the dermis before it spreads out. For most people the bumps flatten within several hours to a day, and the redness around them fades on roughly the same schedule.

Risks and side effects to know

A few pinpoint bruises are possible, especially where the skin is thin, such as near the lower eyelid. They can take three to seven days to clear. Most dermatologists are comfortable with concealer once the injection points have closed, which is usually by the next morning.

For many people the needle is a bigger worry than the bumps. Numbing cream is enough for a lot of skin, and if you're really anxious about needles, nitrous-oxide conscious sedation is available at VOS; we have more than 5,700 cases of it on record.

For the first day or two, skip the sauna, hot baths, hard workouts and a big night out. Heat and a raised heart rate keep the treated skin flushed for longer and make any bruise more obvious. Flying the next day is generally fine. Cabin air is dry, so keep a plain, fragrance-free moisturizer in your carry-on and reapply it during the flight.

Rejuran how long to see results: injection day to month three

The middle rows are where people lose faith. The skin looked better on day four, seemed to drift back by week three, and it's easy to decide the treatment wore off. What has usually happened is that the early plumpness, which is mostly water and mild swelling, faded on schedule while the slower repair was still under way. If you want to see what a realistic change looks like at each stage, I've written about realistic Rejuran results over the weeks.

Why does Rejuran take weeks to show?

Rejuran is made of polynucleotides, purified DNA fragments taken from salmon. A review in the journal Pharmaceutics that compares polynucleotides with the related PDRN describes two kinds of action: the long chains bind water and form a scaffold in the tissue, and they support the fibroblasts, the cells that make collagen and repair the skin's matrix.

The first action is quick and the second is slow. Water binding gives you the plump look within days. Matrix repair takes weeks, for the same reason a healed graze stays pink for a while after the scab is gone: tissue rebuilds at its own pace.

A systematic review of polynucleotides in aesthetic medicine, published in the Journal of Cosmetic Dermatology, reported improvements in measures such as wrinkles, elasticity and hydration across the studies it gathered, and most of those were assessed weeks to months after a series of sessions. That's why I put little weight on how skin looks one week after a single session.

Where it's placed matters too. I inject Rejuran into the dermis, not into fat or muscle. It is a skin-quality treatment: it works on texture, fine crepiness and bounce. It doesn't lift a jowl or fill a hollow cheek, and waiting longer won't change that.

How many sessions before you can judge it?

Many Rejuran Healer plans use a short course, commonly three sessions about three to four weeks apart, followed by occasional maintenance. For a traveler, the gap is the catch. A trip shorter than about three weeks usually holds one session, so the course gets finished over two or three visits to Seoul. I've gone through what that means for planning in Rejuran on a short trip to Korea.

One session does make a visible difference for some people. Still, I'd rather you treat the first trip as the start of a course than as a test. Judging the treatment on one session, at week two, is how people end up deciding it does nothing.

What decides the cost of a course

• Which Rejuran: Healer for the face, Eye for the fine lines around the eyes, or HB, which our price list pairs with the lips
• How much product: the mL needed depends on the area, face only or face and neck
• How many sessions you plan, and across how many trips
• Whether another treatment goes on the same day
• Whether you choose sedation for the injection

Our price list is the same for every nationality. If you want the long version, there's a post on how the cost of Rejuran is put together and one on what a Rejuran injection quote actually counts. For your own face, ask on WhatsApp what a full course would cost, with the areas you care about and the number of trips you can realistically make.

How I approach timing Rejuran around a trip

I start from the date that matters to you, not the date you land. Most people have one: a wedding, a work event, a reunion. Say you're 27, studying in Hong Kong, with five days in Seoul and your cousin's wedding three weeks after you fly back. I'd put the injection on the first or second day of the trip. The bumps and any bruise are gone well before the flight, and the wedding lands around week four, when the early plumpness has settled and the slower change has begun. I wouldn't promise you a visible difference by the wedding, and I'd tell you that before you book.

Then the calendar. VOS is closed on Wednesdays and Sundays, open 10:00 to 19:00 on Monday, Tuesday and Thursday, until 20:00 on Friday, and 10:00 to 16:00 on Saturday. If you land on a Saturday afternoon, your first possible treatment day is Monday, and a Tuesday injection before a Thursday flight still gives the bumps more than a day to settle.

The amount is set for the area in front of me, never more and never less than that skin needs. Extra product at one session doesn't make the repair clock run faster; spacing the sessions is what moves the result.

Worth knowing: The daily mirror can't show a change this slow. Before your first session, take two photos at home at the same time of day: one facing a window, one with the window to your side. Repeat them at week four and week eight. Side light shows texture far better than front light, and the side-lit pair is the one worth comparing.

If there's an event at home, add its date to your message along with a side-lit photo, and ask whether it falls far enough after the first session to plan around.

Who should wait, and what if a bump lingers after you fly home?

Most reactions are short-lived: bumps and redness for hours to about a day, pinpoint bruises for several days, and tenderness to touch for a day or two. Occasionally a small firm bump stays for a week or two before it flattens. How fast the improvement shows, and how much of it you get, varies from person to person; skin with more sun damage often has more room to change than young, firm skin.

As general medicine, these are reasons to wait or skip Rejuran for now:

• An allergy to fish or salmon, since the active ingredient comes from salmon
• Pregnancy or breastfeeding
• An acne flare, cold sore or any infection in the area
• A laser or peel on the same area within the last two weeks or so
• Isotretinoin now or recently
• Blood thinners, or supplements that increase bruising such as high-dose fish oil; tell your doctor instead of stopping anything yourself

Once you're home, a few things sit outside the normal curve: redness that spreads or gets warmer after day two, swelling that grows, pain that increases, pus or a fever. Those need a doctor at home promptly, the same day if you can. Before you leave Seoul, ask for the product name, the amount and the areas treated, and keep them on your phone so a doctor at home knows exactly what went in. You can send a photo of anything that worries you on WhatsApp as well.

Before you message us

Write three things on WhatsApp: your flight dates, one side-lit photo of your cheeks, and anything you take or are allergic to, fish included. The consultation there is free, and when you visit, a medical interpreter for your language is provided at no extra charge.

In person, what decides which Rejuran you get is your cheek texture under side light and how thin the skin is beneath your eyes, because those two set the type and the amount for each area.

The question to send with it is your own: with my dates, which day should the first session go on, and when would the second one fall?

Results, timing and recovery vary from person to person. This article is general information from VOS Dermatology Clinic and does not replace an in-person consultation. Any prices mentioned are from the clinic’s official price list (KRW, before VAT) and may change.