The Korean vaccine scar most people ask about is the round mark the BCG tuberculosis vaccine leaves on the upper arm, and it can usually be made flatter, narrower or less noticeable, though never erased. If you're looking at it ahead of a wedding or a summer of sleeveless tops, the real question is probably this one: will treatment just swap a round scar for a line? That turns on whether your scar is sunken, raised or spreading, and on how hard the skin of your upper arm is pulled every time you lift it.
Scar reconstruction is the core of my work. I trained in reconstructive plastic surgery at MD Anderson Cancer Center in Houston and have led plastic surgery departments at two hospitals, so the trade between one scar and another is the question I'd put first with yours.
The quickest way to ask about your own arm is a pair of photos: one straight on in daylight and one at an angle so the depth shows. Send both on WhatsApp with the question that bothers you most, for example whether surgery would leave a line longer than the mark.
Send daylight photos of your scar on WhatsApp
Get a free consultation in 1 minuteWhat is the Korean vaccine scar, and why do so many arms have one?
BCG is a vaccine against tuberculosis. The US CDC notes that it's given to infants and small children in countries where TB is common, and that it's generally not used in the United States. That's why someone born in Korea often carries the mark while a friend born in the US doesn't.
Risks and side effects to know
The vaccine goes into the skin of the upper arm. A 2017 study of infants in BMC Infectious Diseases describes the usual course: a small raised wheal right after the injection, often followed by a pustule, then a round, flat scar. In that study, the average scar measured about 4.6 mm at 13 months. Some people have a cluster of small pits instead of one mark, which is what a multi-puncture BCG device leaves, and older adults may also carry a smallpox vaccine scar.
Many of these marks are an atrophic scar: the skin sits slightly below its surroundings because tissue was lost while it healed. Some heal raised instead, and a few keep growing.
Which kind of scar do you have?
Your Korean vaccine scar usually falls into one of four patterns, and each one points toward different treatment:
| Scar type | What you see | What is usually considered |
|---|---|---|
| Atrophic (sunken) | A round dent, often paler or shinier than nearby skin | Resurfacing, adding volume under the dip, or excision if it's small |
| Hypertrophic (raised) | Firm and raised, but inside the original mark | Steroid injections, silicone, or excision with a careful closure |
| Keloid | Raised and growing past the original mark, sometimes itchy | Combined treatment, because excision alone tends to recur |
| Multi-puncture cluster | A grid of small pits | Resurfacing more than surgery, since cutting out a grid leaves a longer line |
The American Academy of Dermatology's guide to acne scar treatment groups options the same way, with one set for depressed scars and another for raised ones. That's why much Korean acne scar treatment advice carries over to a sunken vaccine mark.
Here, Korean scar treatment is chosen from the shape, depth and location of the scar, and it can be surgical or non-surgical. The scar revision surgery page lays out what the surgical side involves.
Beliefs about Korean scar removal, checked one by one
“A Korean laser can erase it.” Korean scar removal makes a scar flatter, narrower or less visible. It never erases it, whatever device is used. The American Society of Plastic Surgeons describes the aim of scar revision as making a scar more consistent with the surrounding skin.
“Cutting it out leaves nothing behind.” Excision swaps a round scar for a thin line, and that line is longer than the original mark is wide, because a circle can't be closed flat without tapering ends. On the upper arm, where skin stretches with every reach, the line can also widen over the following months. This is the trade I'd weigh with you most carefully.
“Raised and sunken scars get the same treatment.” They're opposite problems. A sunken scar needs support built back under it, a raised one needs flattening, and treating one like the other can make it stand out more.
“One session before the flight home will do it.” Skin treatments for scars are commonly done as a series with gaps between sessions. I won't name a session count from a photo.
“A keloid can simply be shaved off.” Keloids tend to grow back after excision alone, and the shoulder and upper arm are places where they form readily. If you've ever had a keloid anywhere, say so before any plan is made.
How does the upper arm change the plan?
The deltoid area, where BCG is given, is a high-tension spot. Skin there is pulled each time you lift or rotate your arm, which is one reason a Korean vaccine scar can spread or thicken while it heals, and why a surgical line there needs a closure built to hold against that pull.
Sometimes the scar isn't the only thing you notice in the mirror. If loose skin on the upper arm bothers you as much as the mark, arm contouring in Seoul is a different conversation with its own incision to think about. And if sleeveless season is what brought this up, underarm sweat is a separate issue that our Mira Dry underarm sweat guide covers.
What can go wrong, and who should wait?
After resurfacing-type treatment, redness, swelling and some crusting are expected at first, and the skin can stay pink for a while. After excision, there are stitches and a healing line that often looks red before it fades, with the chance that it widens. Surgery carries risks such as bleeding, infection and inflammation, and your surgeon explains them before you decide. In darker or tanned skin, anything that inflames the area can leave temporary brown marks.
As a general rule, these are reasons to wait or to plan differently:
- an active rash, eczema flare or infection on that arm
- a fresh tan or sunburn over the area
- pregnancy, for any elective treatment
- recent isotretinoin use, before resurfacing
- a personal history of keloids, which changes the plan rather than ruling everything out
Once you're home, watch for redness that spreads, warmth, pus, fever or a wound that opens, and see a local doctor promptly with your treatment record. Sun on a healing scar can darken it, so keep it covered. Whether surgery or skin treatment suits your scar is confirmed at an in-person exam.
Individual results vary.
Before booking, add a third photo to the first two: the scar with your arm raised overhead, so the pull on the skin shows. Send it on WhatsApp and mention whether you've ever had a raised or keloid scar anywhere else.
Send daylight photos of your scar on WhatsApp
Get a free consultation in 1 minuteWhat I look at first on a Korean vaccine scar
A scar looks different depending on its cause, depth, direction, height against nearby skin, and skin tension, so those five shape my choice of method. On a round BCG mark, direction barely exists, so depth and tension usually decide. A shallow dent under little tension leans toward skin treatment. A deep pit or a firm raised scar is where the surgical question comes in.
Doctor's note
A vaccine scar is small, and that's exactly why I'm careful with it. Revision only makes sense if what you end up with is less noticeable to you than what you started with. On a moving arm, a neat line isn't automatically less noticeable than a small round dent. If I think the line would draw more attention, I'll say so and suggest a skin treatment or leaving it alone.
For the trip itself, we're a short walk from Sinsa Station, Exit 8, on Line 3 and the Shinbundang Line. We see patients Monday to Friday from 10:00 to 19:00 and Saturday from 10:00 to 17:00, and we're closed on Sundays and public holidays. I can't give a fixed recovery period for scar revision here, so ask at booking how long stitches would stay in for your plan and leave room in your dates. If you're adding a larger operation to the visit, the cheekbone reduction surgery travel guide shows how a longer surgical stay is laid out.
If you'd like to start, message us on WhatsApp with the dates you could be in Seoul and a line, in your own words, on whether the mark is sunken, raised or a cluster of dots.
Frequently asked questions
Is a BCG scar a sign that something went wrong with the vaccine?
No. A round, flat scar is the expected result for most people after BCG. A scar that keeps growing past its border, itches or thickens is less common and worth having examined.
Can volume fill a sunken vaccine scar?
Adding volume under a dip is one general approach for depressed scars. A small dent tethered to deeper tissue may not lift with volume alone, so whether it suits your mark is decided at the exam.
Can a revised scar come back?
A revised scar is still a scar, and it goes through its own healing. Raised scars and especially keloids can recur, which is why a keloid history changes the plan from the start.
Which doctor treats scars at Pascal?
Scar reconstruction is listed under Dr. Bae Seung-joo, a plastic surgery specialist with an MD and PhD. You meet your surgeon at your consultation.
Is there a better season to treat an arm scar?
Healing skin darkens more easily in the sun, so many people choose a time of year when the arm stays covered for several weeks afterward. Work back from any sleeveless event with that in mind.
This article is general information, not medical advice. Individual results vary, and surgery carries risks such as bleeding, infection and inflammation. Your surgeon confirms suitability at an in-person exam. Read the medical disclaimer.
Scar reconstruction · Facelift · Rhinoplasty · Eyelid surgery · Skin
