What's Normal Right After Rejuran? Bumps, Flying and Home Care

Is it normal to see raised bumps from Rejuran immediately after the session, and who do you ask if something still looks wrong once you've flown home?

Yes, the bumps are expected. They are small pockets of product sitting in the upper skin, and they usually flatten within a few hours to a day or two. Redness tends to fade the same day; a bruise, if you get one, can take up to about a week.

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 see you from the consultation through the treatment and I do the injections myself, so how deep and how close together those bumps sit is my decision, made with your flight date on the table. The clinic recorded more than 50,000 cases between January 2023 and April 2026, and if needles worry you more than bumps, nitrous-oxide sedation has been used here more than 5,700 times.

If your session and your flight are close together, send your treatment date, your flight time and one photo of your face in window light on WhatsApp, and ask whether that gap is enough for your skin. The consult on WhatsApp in English is free.

What your skin looks like in the first hour

Rejuran comes in three forms on my menu. Healer is polynucleotide (PN) on its own, HB combines PN with hyaluronic acid and lidocaine, and Eye is formulated for the thin skin under the eyes. All three go in as many small, shallow injections, so when you sit up and look in the mirror, your cheeks look like a neat grid of mosquito bites.

Expect pink skin, a warm, tight feeling, and a few pinpoint spots of blood that stop with light pressure. Under the eyes the dots look puffier, because the skin there is thinner and shows every change. None of this means the product went in wrong. It sits where it's meant to: in the dermis, close to the cells that make collagen, rather than deeper, where you would never see a bump at all.

The instinct in that first hour is to press the bumps flat or rub them to spread the product. Leave them alone. The product spreads as the tissue absorbs it, and rubbing mostly adds redness and raises the chance of a bruise.

Why do the bumps appear, and how long do they last?

PN is made of long DNA fragments, and in the syringe it behaves like a soft gel rather than a thin liquid. A review in Pharmaceutics comparing PN with the shorter-chain PDRN describes this gel-like, scaffold-forming quality as one of the main differences between the two. That's why each injection point lifts into a small dome instead of disappearing the moment the needle comes out.

Over the next hours the fluid part is absorbed and the domes sink back. Most are flat by the evening or the next morning. Points in thinner skin, or an area that received more product, can stay visible a little longer. HB carries hyaluronic acid, which holds water, so it may look slightly fuller on the first day. A systematic review of polynucleotides in aesthetic medicine, published in the Journal of Cosmetic Dermatology, found that the side effects reported in the studies were mostly mild, short-lived reactions at the injection points.

Say you're 34, living in Sydney, with Rejuran Healer booked for a Friday afternoon and a flight home on Saturday night. Friday is the clinic's late day, open until 20:00, so the session can sit at the end of a day of sightseeing. By Saturday morning most of the bumps will usually have settled into faint texture you only notice up close. A small bruise near the jaw is the thing most likely to still be there when you board, and I'd be comfortable with that plan.

Now change one detail: the same reader wants Rejuran Eye and bruises easily. Then I'd suggest moving the session two or three days earlier in the trip, because under-eye bruises are the slowest mark to clear and the first thing anyone at the arrival gate will notice.

The first 48 hours: what to do and what to skip

Most aftercare comes down to not irritating skin that has just had dozens of tiny punctures. This is the general guidance dermatologists give after shallow injections, laid out by time.

Two things people don't expect. Retinoids and exfoliating acids such as glycolic or salicylic acid sting on freshly injected skin, so leave them out of your travel kit for the first couple of days. And the jjimjilbang or spa visit many people save for their last night in Seoul is the one stop I'd move to before the session. Heat widens the small blood vessels and makes redness and bruising more noticeable.

Can you fly the same day or the next morning?

For most people, yes. Flying doesn't change how PN behaves in the skin, and the bumps flatten on a plane the same way they do in a hotel room. What changes is comfort. Cabin air is dry, so a plain moisturizer in your hand luggage helps with the tight feeling.

Keep pressure off your face. A sleep mask strapped tight over freshly treated under-eyes, or hours with your cheek pushed into a travel pillow, is how a faint mark becomes a bruise. Wear the mask loose, or skip it on the first flight.

The scheduling detail that matters more than the flight is the clinic calendar. VOS is closed on Wednesdays, Sundays and public holidays, and Saturday hours are 10:00 to 16:00. A Saturday session before a Monday flight leaves you a Sunday with the clinic shut. If you'd like the option of stopping by again before you leave Seoul, put the session on a Monday, Tuesday, Thursday or Friday earlier in the trip.

Worth knowing: The bumps are not the result. Changes in texture and fine lines build over the following weeks, after you are home, so the mirror in your hotel room tells you very little. How that later stage usually looks is in Rejuran results week by week, and the timeline for glass-skin booster treatments shows the same slow pattern for other boosters.

How I approach a session when you fly home soon after

Every plan starts with my skin analysis, and the date you fly is part of that analysis. When the gap between the session and the flight is short, three things shape what I do.

The type. On thin, reactive cheeks HB is often the easier choice, because the lidocaine in it makes the injections easier to sit through and the hyaluronic acid adds hydration. Under the eyes, Eye is the form made for that skin, but it is also the area most likely to bruise, so it's the one I'd least like to do the day before a long flight.

The amount. I give the exact dose your skin needs, never more and never less, and that matters here. Extra product in one sitting doesn't bring the result sooner, and it does keep the skin bumpy for longer. Rejuran works as a course, and one Rejuran Healer session is usually not enough on its own, so spreading sessions across trips makes more sense than overloading one visit.

Bruising and risk: what to watch for

Your bruising risk. Fish oil, vitamin E, ginkgo and blood-thinning medicines all make bruises more likely. Tell me what you take. Whether to pause a medicine is a question for the doctor who prescribed it, and I won't ask you to stop something you need. If you're over 40 and leaning toward HB, how many healing days to leave in your trip goes into that in more detail.

What's normal at home, and when should you message or see a doctor?

Bruising and bumps that linger

Normal looks like this: a small bruise that fades over about a week, a few points of texture for a couple of days, and mild tenderness when you touch the area. Healing times, like results, vary from person to person, so treat these as typical ranges and not as promises.

A bump you can still clearly see or feel after a week is outside the usual course. It isn't an emergency. Photograph it every morning in the same daylight, from the front and the side, so you can see whether it is shrinking.

Infection or allergy signs: get seen where you are

Redness that spreads or gets hotter after the second day, pain that keeps increasing, pus, or a fever all need a doctor near home promptly, so don't wait until your next trip. Hives, swelling that spreads beyond the treated area, or any difficulty breathing are an emergency: call your local emergency number. Take the product name (Rejuran Healer, HB or Eye), the date and the areas treated with you, which is why the label photo in the next section matters.

Who should wait, or skip it

As general medicine, Rejuran is best postponed if you have an active infection, a cold sore or an acne flare in the area, or if you are pregnant or breastfeeding. The PN in Rejuran is derived from salmon, so an allergy to fish or fish-derived ingredients needs discussing first, as does a lidocaine allergy if HB is planned. A recent laser or peel on the same area, isotretinoin in the past months, or a bleeding disorder are also things to raise at the consultation before anything is injected.

What should you pack and photograph before you leave Seoul?

Before you leave the clinic, ask for the product type and the amount used to be written down, and take a photo of it. If anything comes up at home, a doctor there will ask exactly that, and the name alone isn't enough when Rejuran comes in three forms.

The morning after the session, take a baseline photo: no makeup, the same window, face straight on and both sides. This is your reference. Comparing a day-five bruise against a memory is how people talk themselves into a problem that isn't there, or miss one that is.

Pack a low-pH cleanser, a plain moisturizer and a mineral sunscreen, and leave the retinoid and acid toner at home for the flight. Save the name and number of a local GP or dermatologist before you fly, so you aren't searching for one with a swollen cheek. Then set two phone reminders, at one week and at four weeks, to retake the photo in the same light. The four-week photo is the first one worth judging the treatment by.

Before you message us

There are two good moments to write. Before you book, send your treatment dates and flight time with one daylight photo of the area, and ask whether the bumps will usually have settled on skin like yours by the time you board. After you're home, if something doesn't match the table above, send a daylight photo with your session date. The consult on WhatsApp in English is free, and if English isn't your first language, a medical interpreter for your language is provided at no extra charge.

When you're here, the first thing I look at is how thin the skin is on your cheeks and under your eyes, because that decides how small and how shallow each injection point should be with a flight a day or two away. The clinic is at 806 Eonju-ro, Gangnam-gu, in front of Dosan Park. Send your dates on WhatsApp with the one question you have about your own flight home.

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.