Korean Botox Side Effects: What Is Normal and What Is Not
On this page
I'm Dr. Jong Seon Kim, a plastic surgeon at Gangnam HERA in Seoul and a board member of the International Petit Medical Society, and most of my clinical day is spent on fillers and injectables. Before they book botox in Seoul, a surprising number of patients send me the same worried message: "Are Korean botox side effects worse? I keep reading about droopy eyelids and frozen faces β what actually goes wrong, and what do I do if it happens to me?" The short answer: most side effects of botox are small, local and temporary β a needle mark, a little redness, now and then a bruise β and they settle by themselves. The less common ones, such as a heavy brow or an uneven smile, come from where and how much toxin was placed, not from the fact that the product was made in Korea. Because the toxin wears off, even those fade with time. Below I explain why side effects happen, what is normal, which signs mean you should contact a doctor straight away, and how we reduce the risk before the needle goes in.
What side effects can botox actually cause?
The common ones are minor and local: tiny needle marks, slight redness, a little swelling and, occasionally, a small bruise β usually gone within hours to a day or so. These come from a fine needle passing through skin, and they happen with every brand. After muscle botox the downtime is minimal and most people go straight back to their day. After skin botox, where a diluted toxin is placed in the superficial dermis across a wider area, mild redness and tiny marks usually settle within a day.
Less common are effects from the toxin relaxing a muscle it was not meant to reach, or relaxing the intended muscle more than planned. Which one depends on the area:
- Forehead and frown lines: a brow that feels heavy or sits lower, or, rarely, an eyelid that droops.
- Crow's feet: a smile that looks slightly different around the eyes.
- Jaw (masseter): an uneven smile, chewing fatigue, or a hollow look if the muscle is reduced too far.
- Shoulder line (trapezius): a sense of tiredness or weakness in the shoulder.
- Underarm: marks and mild tenderness at the injection points.
All of these are temporary, because the toxin itself is temporary. I go through the jaw in detail in masseter botox gone wrong, so I will not repeat it here.
Why do botox side effects happen?
Almost always for one of three reasons β the needle, the dose or the placement β and occasionally because the treatment did not suit the person in the first place.
The needle
Marks, redness and bruising come from the injection, not the toxin. Thin skin, an area with many small vessels, and heat or rubbing straight afterwards all make a bruise more likely.
The dose
Too much toxin for the muscle in front of you makes it relax more than intended: a forehead that cannot move at all, a jaw that tires when chewing. A "standard" dose is a starting point, not a decision. Muscles differ in size and strength between people, and between the two sides of the same face.
The placement
The toxin acts where it is placed and a little around it. Too close to a neighbouring muscle, or at the wrong depth, and that neighbour relaxes too β this is how a heavy brow or a crooked smile happens. Rubbing the area or lying down in the first hours can also move it before it settles, which is why the aftercare is what it is.
The person
Botox is not suitable during pregnancy or breastfeeding, or for people with neuromuscular disorders, and skin botox is not for anyone with a known sensitivity to botulinum toxin. That is why I ask about your medical history and medications before anything else.
Are Korean-made toxins riskier than imported ones?
Not in the way most people fear: the Korean-made toxins we use are botulinum toxin type A, like the imported ones, and they relax muscle by the same mechanism β so the side effects that matter come from dose and placement rather than the country on the box. At HERA we use four products. Coretox is made by Medytox in Korea. Newlux is made by Newmeco, a Medytox affiliate, and is approved by Korea's Ministry of Food and Drug Safety. Allergan Botox is the original brand with the longest clinical record, and Xeomin is made by Merz in Germany.
Where they genuinely differ is formulation. Xeomin and Coretox are complexing-protein-free, which is associated with a lower theoretical risk of the body developing antibody resistance with repeated treatment. Resistance is not a side effect you feel; it would show up as a toxin that seems to work less well over the years. If you expect frequent treatment, that is worth discussing. I compare the four products fairly in Korean botox vs American botox.
What I would worry about more than the brand is a product you cannot identify. Ask which product is being used, and expect to see it named on your estimate.
What is normal after botox, and when should you contact a doctor?
Small marks, slight redness and a little tenderness in the first day are normal; anything that spreads, gets worse, or affects swallowing, speaking or breathing is not.
Normal, and usually gone within a day or two
- Tiny needle marks or small bumps at the injection points
- Slight redness or mild swelling
- A small bruise, which can take longer to fade than the marks
- The effect arriving gradually β most people notice it within 3~7 days, with the full result at around two weeks
Contact the clinic that treated you
- One side clearly different from the other once the result has developed
- A brow or eyelid that feels heavy, or a smile that looks uneven
- Chewing fatigue after jaw treatment that is getting worse rather than easing
- Redness, warmth or pain that increases after the first day instead of settling
Seek medical care straight away
- Difficulty swallowing, speaking or breathing
- Weakness spreading beyond the treated area, or double vision
- Swelling of the face or lips, a widespread rash, or wheezing
These urgent signs are rare. I list them because you should know them, not because you should expect them. If you are travelling, keep the clinic's contact details with you and a note of which product and areas were treated.
How do you reduce the risk of side effects?
By planning the dose and injection points around your own muscles, starting conservatively, and following a few hours of simple aftercare. Most of the work happens before the needle goes in.
- Tell the doctor everything. Pregnancy or breastfeeding, neuromuscular conditions, medications, and any previous toxin β which product, which area, and how it went.
- Expect an examination, not a menu. I ask you to frown, raise your brows, smile or clench so I can see and feel the muscle before marking the injection points.
- Start low. Toxin can be added at a review; it cannot be taken out. Unlike hyaluronic acid filler, botox has no dissolving agent.
- Follow the aftercare. For a few hours after muscle botox, avoid rubbing the area, lying down and heat such as saunas or hard exercise. After skin botox, avoid vigorous exercise, saunas, hot baths and alcohol for 1~2 days to reduce swelling and bruising.
- Time it within your trip. Have it done early in your stay, so the effect has started to develop while you can still reach us.
Who injects matters as much as what is injected. At HERA the doctor examines, marks and injects, and the session itself usually takes about 5~10 minutes.
What should you do if a side effect has already happened?
First, know that it is temporary: botox generally fades over about 3~4 months, and the side effects that come from it fade with it. Marks, redness and bruises settle on their own; avoid heat and rubbing, and give them a few days.
For a placement or dose effect β a heavy brow, an uneven smile β the honest answer is mostly time. There is no dissolving agent as there is for hyaluronic acid filler. In some cases a small, careful adjustment on the untreated side can make the two sides look more even while the effect wears off; adding more toxin to the side that is already over-relaxed is not the answer. Whether an adjustment makes sense depends on what was used and when, so bring the product name, the areas, the dose if you know it, and the date.
If you were treated elsewhere and are not sure what you had, we can still examine you. I would rather see you and advise waiting than leave you guessing. And if your worry is simply that the result looks different from what you expected, our botox before and after guide explains what a normal timeline looks like.
What patients ask me next
"Is botox in Korea less safe because it costs less?"
No. What drives the estimate is the area, the dose, the product and how often you repeat it β not a lower standard of care. The Korean-made products are generally the more accessible line. I explain this in how much botox costs in Korea, and the wider picture in our guide to botox from Korea.
"Are the side effects different for skin, jaw or underarm botox?"
The common ones β marks, redness, the odd bruise β are the same; the less common ones follow the area. Skin botox stays in the skin layer, so it is designed not to change your expression; what decides its cost is set out in skin botox cost in Korea, and realistic results in Korean skin botox before and after. Jaw treatment is where chewing fatigue belongs β see how much masseter botox costs in Korea. For sweating, hyperhidrosis treatment in South Korea and underarm botox price in Korea cover the underarm.
"I had a side effect last time. Can I have botox again?"
Usually, yes, once we understand why it happened. Tell me the product, area and dose from last time; I will plan a more conservative first session and review you rather than repeat what caused the problem.
The honest limits
No injector can promise zero side effects. Needle marks and the occasional bruise come with any injection, and the same dose behaves a little differently in two faces. Results vary from person to person. Botox relaxes muscle; it is temporary by design, and it is not suitable for everyone. What I can promise is an examination before a plan, a conservative first dose, a clear explanation of what is normal and what is not, and a written estimate before anything begins.
Book a consultation
If you want to plan botox carefully β or something from a previous treatment has not settled β send us the areas, the product if you know it, and a photo at rest and in movement. We will arrange a consultation in Gangnam, or a photo consultation first if you are still abroad. An English interpreter joins every visit, and you receive an itemised written estimate before anything begins β international and local patients pay exactly the same.
FAQ
Frequently asked questions
Q1Are Korean botox side effects worse than with imported botox?
No β the Korean-made toxins HERA uses are botulinum toxin type A and work by the same mechanism as imported ones, so side effects depend mainly on dose and placement. The common ones are tiny needle marks, slight redness and occasional bruising, which usually settle within a day or two.Q2What are the most common side effects of botox?
Tiny needle marks, slight redness, mild swelling and sometimes a small bruise at the injection points. They come from the needle rather than the toxin and usually settle on their own within hours to a day or so.Q3When should I contact a doctor after botox?
Contact the clinic if one side looks clearly different once the result develops, a brow or eyelid feels heavy, or redness and pain increase after the first day. Seek medical care straight away for difficulty swallowing, speaking or breathing, spreading weakness, or swelling of the face or lips.Q4How long do botox side effects last?
Needle marks and redness usually settle within a day, and placement-related effects fade as the toxin wears off, generally over about 3~4 months. Results vary from person to person.Q5How can I reduce the risk of botox side effects?
Share your full medical history, choose a doctor who examines your muscles before dosing, start conservatively, and follow the aftercare. For a few hours after treatment avoid rubbing the area, lying down and heat such as saunas or hard exercise.
HERA Journal
Keep reading
InjectablesSkin Botox Cost in Korea: What Decides What You Pay
Why I don't print a skin botox price, the four things that decide the cost in Korea, how often you will realistically pay, and how to compare quotes.
7 minRead β
InjectablesUnderarm Botox Korea Price: What Decides What You Pay
Why I don't publish an underarm botox price, the four things that set the cost in Korea, how many sessions to budget for, and how to compare quotes.
7 minRead β
InjectablesFat Dissolving Injections Korea Before and After: What Changes
A fair fat dissolving before and after shows a smaller pocket and a cleaner line, built over weeks. Here is what changes by zone, when to judge it and how to read photos.
7 minRead β
On TikTok
TikTok
Is morning the best time for upper eyelid fillers? π€ Our doctor explains why the timing of your appointment can make a difference during your consultation. Watch until the end to learn why. β¨
@gnheraclinic_en
Can one thread lift improve both lifting and skin quality? π€ Our doctor explains how the key components of the Aptos Thread Lift work and what makes it different from traditional threads. Watch until the end to learn more. β¨
@gnheraclinic_en
Thinking about a thread lift? π€ Aptos is more than just a PDO thread. Our doctor explains what makes it different and why it's become a popular lifting option. Watch until the end to learn how it works. β¨
@gnheraclinic_en
Would you choose sedation for Ultherapy? π€ Our doctor shares why he personally wouldn't recommend itβeven for his own family. Watch the full explanation before making your decision. β¨
@gnheraclinic_en
HIFU or RF β which one does your face actually need? They both lift your skin β but in completely different ways. Which one is right for your face? Explained by a Korean aesthetic doctor. Save this before getting a lifting treatment.
@gnheraclinic_en
Noticing drooping mouth corners after 40? A small change can make a big difference. Lip filler + corner Botox β Restore lip volume β Lift the mouth corners β Brighter smile πGangnam HERA Clinic β Seoul Korea Follow @gnheraclinic_en
@gnheraclinic_en
Re2O vs Rejuran Which skin booster is right for your skin? Korean aesthetic doctor explains the difference.
@gnheraclinic_en
HIFU = Hollow Cheeks? Depends on your face type. Slim faces + strong HIFU can cause volume loss. Customized treatment is key.
@gnheraclinic_en
Jaw Botox mistake? Hereβs why some faces look βpeanut-shaped.β Placement matters. Save this before your next appointment.
@gnheraclinic_en
Want a smaller-looking face? Itβs about placement. Save this.
@gnheraclinic_en
One treatment Iβd recommend for parents? You might be surprised.
@gnheraclinic_en
β¨ Under-Eye Filler Correction & Re-Treatment β¨ Sometimes, filler isnβt about adding more β itβs about doing it properly and safely. In this case, the under-eye area required: β Filler dissolving (hyaluronidase) β Careful assessment of the depth and placement β A natural re-treatment for a smoother result The tear trough is one of the most delicate areas of the face, so precision and experience truly matter. At Gangnam HERA Clinic in Seoul, we specialise in: π Under-eye filler correction π Tear trough rejuvenation π Natural, balanced results (never overfilled) If youβre visiting Korea and looking for a trusted clinic in Gangnam, Seoul, we provide full English support for international patients. πGangnam, Seoul π© DM us to book a consultation
@gnheraclinic_en
β¨ Chin Filler for Facial Balance β¨ A small change can make a big difference β especially in your side profile. At Gangnam HERA Clinic in Seoul, chin filler is designed to: β Improve facial harmony β Enhance the jawline naturally β Create a softer V-line effect β Support a more defined profile (without surgery) Our treatments are doctor-performed, highly precise, and always tailored to your unique facial structure. If youβre looking for natural chin filler in Gangnam, Seoul, we offer full English support for international patients. πGangnam, Seoul π© DM us for consultation & booking
@gnheraclinic_en
β¨ Natural Lip Filler in Seoul (Gangnam) β¨ Subtle, balanced, and beautifully tailored to your facial features. At Gangnam HERA Clinic, our lip filler treatments focus on: π Soft volume (not overdone) π Better lip symmetry π A more youthful, refreshed look π Doctor-performed, precision-based results If youβre visiting Korea and looking for a trusted clinic in Gangnam, Seoul, we provide full English support for international patients. πLocated in Gangnam, Seoul π© DM us to book your consultation
@gnheraclinic_en
Restore Your Youth: The Magic of Hand Fillers β¨β Do you find yourself hiding your hands because of visible veins, tendons, or wrinkled skin? As we age, we lose volume in our hands, making them look older than we feel. But you don't have to let your hands give away your age! At Gangnam Hera, we provide a professional solution to restore that smooth, youthful look: β Volume Restoration : Fills in hollow areas where fat has been lost. β Vein & Tendon Camouflage : Softens the appearance of protruding vessels for a softer look. β Smooth Texture : Deeply plumps the skin to reduce the "wrinkled" appearance. Experience an instant rejuvenation with natural-looking results. Let your hands match your youthful glow! π
@gnheraclinic_en
The Secret to "Soft Tofu" Skin? Only at Gangnam Hera! π₯β¨ Ever heard of the "Soft Tofu" Skin Booster? Just like the name suggests, itβs the ultimate secret to achieving a bouncy, bright, and milky-white complexion. The star ingredient is Glyju, a revolutionary booster made from Glyceollin (soybean-derived) β Powerful Whitening: Blocks melanin synthesis for a clearer skin tone. β Vascular Health: Promotes skin regeneration and healthy glow. β Instant Hydration: Packed with Hyaluronic Acid to erase dryness. Why Gangnam Hera? π€« Glyju is amazing on its own, but we do it differently. At Hera, we combine it with an exclusive secondary treatment that boosts the results by 200%. This unique "Secret Formula" is available only at our clinic, giving you that signature whitening glow you can't find anywhere else. Ready for your Soft Tofu transformation? Experience the newest trend in Gangnam! π
@gnheraclinic_en
Juvelook I + EBD The Perfect Synergy πβ‘οΈ Why combine Juvelook I with Energy-Based Devices (EBD)? Because they work better together! Juvelook I: Stimulates deep collagen production. EBD : Tightens skin tissue using thermal energy. At Gangnam Hera, we provide both to give you volume and lifting at the same time. π Already had Juvelook? We recommend a 2β3 week interval for absorption before starting your device treatment.
@gnheraclinic_en
I asked AI (Gemini 3.0) about the future of lips, and the answer was clear: Be Yourself. β¨ π¬ 2026 Lip Trends (Quick Summary) 1οΈβ£ Beyond Volume π Less is More! Itβs all about a natural, healthy glow over fake volume. 2οΈβ£ Hybrid Care π§ Filler + Skin Booster (Rejuran/Exosome). Shape with filler, hydrate with boosters. 3οΈβ£ Advanced Safety π‘οΈ New materials, longer results, and fewer side effects. (P.S. I asked Gemini how old it is, and it said it doesnβt age... Must be nice! But for us humans, we have Gangnam Hera to keep us youthful! π) π Visit us in Gangnam for your 2026 personalized lip design.
@gnheraclinic_en
Stop guessing! Here is the REAL difference between Rejuran i and Juvelook i. π β Rejuran i Hydration & Glow. Perfect for fixing dry, "crepey" skin and adding that healthy inner radiance. β Juvelook i Natural Volume. Perfect for filling hollow tear troughs by boosting your natural collagen. No bumps, just smooth skin. One heals the skin, the other fills the hollows. Which one is your concern? Tell us in the comments! π¬
@gnheraclinic_en
Say goodbye to vertical neck wrinklesβWITHOUT surgery! π ββοΈβ¨ Vertical neck lines used to be the hardest to treat, often needing a surgical neck lift. But the trend has changed NOW Introducing the CaHA Skin Booster treatment! π By spreading diluted calcium filler evenly under the vertical folds, we stimulate your skin to regain its firmness and bounce naturally. Perfect for β Loss of skin elasticity β Deep vertical neck bands β Those wanting surgical results without the downtime The future of neck rejuvenation is here at Gangnam Hera. π€
@gnheraclinic_en
Even without lifting, your look can change this much. By adding only the necessary amount of filler to the temples, lateral cheeks, and chin, and combining chin Botox with Juvelook Eye, we refined the overall balance. Not to look unnaturally younger, but natural and smooth. This is a case that shows how much of a difference filler alone can make. π© For consultations and appointments, please contact us via DM or WhatsApp. * Results may vary by individual.
@gnheraclinic_en
As we enter our 40s, many people start to notice: βοΈ Looser facial contours βοΈ A double chin βοΈ Deeper neck lines Improvement isnβt only about βlifting.β By reducing excess volume, refining the contours, and adding volume only where needed, the overall appearance can change significantly. This case combines: Ultherapy, fat-dissolving injections, Botox, and filler. Not to look unnaturally younger, but to look natural, clean, and refined. We offer facial contouring tailored for your 40s, with a balanced and thoughtful approach. For inquiries and appointments, please contact us via DM or WhatsApp.
@gnheraclinic_en
A special New Year message from the doctors at HERA. π May your 2026 be as bright and glowing as the skin youβve always dreamed of. We are so grateful to be part of your beauty journey. Stop the screen to reveal the blessing waiting for you! π§§β¨ Wishing you a year of overflowing happiness and health. Happy New Year! π
@gnheraclinic_en
Body Ultherapy? π Meet Sizer. π’FDA-approved for belly fat reduction. Goes deeper. Works better. Sizer + fat-dissolving injections = π₯
@gnheraclinic_en
On YouTube
YouTube Shorts
Quick, honest answers from our doctors β tap any short to play.
Your medical team
A Medical Team That Sees You Through, Start to Finish
Board-certified specialists who treat every patient like family β the same doctor guides you from your first consultation to your final result, aiming for natural beauty with minimal need for revision.
Jong Seon Kim, MD
βI am a doctor you can trust, dedicated to enhancing your natural beauty.β
Career & Credentials
- Director, Gangnam HERA Plastic Surgery Clinic
- Board Member, Korean Society of Aesthetic Surgery (KSAS)
+9 more
Dr. Lee Jong Hoon
βI dedicate myself to achieving the best results with minimal need for revision.β
Career & Credentials
- Co-author, LIFTINGOLOGY: Science and Clinical Practice in Aesthetic Medicine
- Recipient, Minister of Health and Welfare Award for Outstanding Contribution to National Health Improvement
+11 more
