EN
Laetigen side effects are short-lived injection-site reactions (small bumps called embossing, swelling, bruising, redness and mild stinging) that usually settle within 1 to 7 days after a dermal injection of 99.9% pure type I atelocollagen. Most people see them fade within the first 1 to 2 days.
“How bad will my skin look afterwards, and for how long?” This is usually the last question patients ask me before booking Laetigen, and it is the right one to ask. Knowing a product works is one thing. Knowing whether you can go to a dinner on Friday or board a flight home on Sunday is what actually shapes your plans.
I’m Dr. Lee Sung-wook, a board-certified plastic surgeon at MINE Plastic Surgery & Dermatology in Seoul. In this article I focus on one topic only: Laetigen side effects. You will find a reaction-by-reaction timeline, the rarer delayed reactions described in the medical literature, who should not have this treatment, and the aftercare that helps you recover faster. If you want the product background first, start with our full Laetigen overview.
Dr. Lee’s key point: Laetigen side effects are mostly small and brief, but bruising can take up to a week to clear, so plan any important event with that week in mind.
Why Laetigen Side Effects Happen: What Goes Into Your Skin
To understand any reaction, it helps to know exactly what is being injected and where. Laetigen is an injectable made of 99.9% pure type I atelocollagen, approved as a medical device by Korea’s Ministry of Food and Drug Safety (MFDS). This is a Korean regulatory approval.
Pure type I atelocollagen placed in the dermis
The dermis is the thick, supportive middle layer of your skin, sitting just below the surface. According to dermatology textbooks, type I collagen makes up about 80 to 85% of the dermal matrix (the scaffolding that gives skin its strength), and the amount is lower in sun-damaged skin. Laetigen supplies this same type of collagen directly into that layer.
Because the collagen is placed with many tiny injections, each needle point is a small wound in itself. That simple fact explains most Laetigen side effects: a little fluid and collagen sitting in the skin (bumps and swelling), a tiny vessel nicked by the needle (bruising), and the skin’s normal response to being pierced (redness and stinging).
Three design choices that keep reactions small
Laetigen side effects tend to stay mild, and three features of the product explain why:
- Telopeptides removed. Telopeptides are the short end pieces of a collagen molecule, and they are the part the immune system is most likely to recognise as foreign. They are cut off with an enzyme, leaving “atelocollagen” (collagen without those ends), which lowers the chance of a foreign-body reaction.
- Autoclave sterilisation. The product is sterilised with high-pressure steam, the same principle used to sterilise surgical instruments.
- Near-neutral pH. Its pH is close to that of the dermis (about 7.2). An acidic or alkaline injection tends to sting and swell more, so a matched pH helps keep discomfort and puffiness low.
One more detail matters for the allergy section below: Laetigen is a porcine-derived (pig-derived) collagen. That is different from the bovine (cow-derived) collagen fillers used in past decades.
Laetigen Side Effects Day by Day: A Recovery Timeline
There is no formal downtime with Laetigen. Most people return to normal daily life the same day. What you may notice is one or more of five common, temporary reactions.
The 5 common reactions and how long each lasts
| Reaction | Typical duration | What it looks like |
|---|---|---|
| Embossing | 1–2 days | Small, grain-like bumps at each injection point that flatten as the collagen settles |
| Swelling | 1–3 days | Mild puffiness, more visible where skin is thin, such as under the eyes |
| Bruising | 3–7 days | A small bruise where the needle touched a tiny blood vessel; usually coverable with concealer from the next day |
| Redness | A few hours to 1 day | Pink flushing over the treated area |
| Mild stinging | Same day | Slight tenderness or prickling at the injection points |
In my clinical experience, embossing usually lasts 1 to 2 days, swelling 1 to 3 days and bruising 3 to 7 days after a Laetigen injection. Not everyone gets all five; many patients only see the bumps and a little redness.
Day 0, days 1–3, days 3–7: what to expect
- Day 0 (treatment day): Redness, stinging and visible bumps are at their peak. Redness typically fades within hours.
- Days 1–3: Bumps flatten and swelling goes down. Most of the visible Laetigen side effects are gone by the end of day 2.
- Days 3–7: Only a bruise, if you had one, may still be fading from purple to yellow. Bruises usually clear within a week.
Planning around an event: the 1-week buffer
Because a bruise is the slowest reaction to disappear, I recommend leaving about one week between your Laetigen session and any important event, such as a wedding, a photo shoot or a business presentation. If you are visiting Seoul, scheduling the treatment early in your trip gives you that week before you fly home.
Rarer Reactions: Delayed Collagen Sensitivity and Warning Signs
An honest discussion of Laetigen side effects should also cover what is uncommon. Collagen injectables have been studied for decades, and the literature gives a useful picture of the rarer reaction type: delayed hypersensitivity, meaning an immune reaction that shows up days or weeks later rather than immediately.
What the medical literature says about collagen injectables
In textbook data on bovine collagen, about 1% of people with a negative skin test still developed a delayed reaction at the treatment site, and such reactions resolved on their own within 4 to 24 months. Textbooks also note that creams, injections directly into the reaction, or a short course of corticosteroids (anti-inflammatory steroid medicines) were usually effective. Researchers believe this delayed sensitivity was a dose-related response to a weakly reactive molecule, which is why small test doses did not always predict it.
Please read these numbers carefully: they come from older bovine-collagen products, not from Laetigen. Laetigen is a porcine-derived atelocollagen, so these figures are not Laetigen-specific rates and should not be read as such. I share them so you understand the general safety profile of this family of injectables, not to suggest a particular figure applies to your treatment.
Signs that mean you should contact the clinic
Normal Laetigen side effects get smaller day by day. Contact us if you notice any of the following:
- Redness or firm lumps that appear, or get worse, days to weeks after treatment instead of fading
- Pain that increases rather than eases
- Warmth, pus or fever, which can point to infection
- Swelling that is still growing after about 3 days
Early assessment makes these situations much simpler to manage, so please don’t wait to see whether they settle.
Who Should Not Get Laetigen (and Who Tolerates It Well)
The safest way to avoid problematic Laetigen side effects is to make sure the treatment suits you in the first place.
Contraindications
I advise against Laetigen if any of the following apply to you:
- Active skin infection or inflammation at the treatment site
- Allergy to collagen or to porcine-derived (pig-derived) ingredients
- Pregnancy or breastfeeding
- A tendency to form keloids (thick, raised scars that grow beyond the original wound)
Also tell your doctor if you bruise easily or take blood-thinning medication, since both make bruising more likely and may change how we plan your session.
Who is usually a good fit
Laetigen is generally well tolerated by people in their 30s and older with early loss of firmness, fine lines or enlarged pores, and by those with dry or sensitive skin. It can also be a good option for patients who did not respond well to collagen-stimulating boosters.
How the Laetigen Procedure Is Set Up to Limit Side Effects
Several steps before and during the appointment are there specifically to reduce Laetigen side effects, especially bruising and discomfort.
Before your appointment
- Avoid heavy drinking on the day of treatment; alcohol widens blood vessels and makes bruising more likely.
- Aspirin and other blood-thinning medicines are usually paused for one week beforehand, but only after you have checked with the doctor who prescribed them. Never stop a prescribed medication on your own.
- Let us know about any skin trouble in the area you plan to treat.
On the day: numbing, injection, total time
A Laetigen session takes about 40 to 50 minutes, including 20 to 30 minutes of numbing cream. The collagen is then placed evenly into the dermis using an injector device or by hand. Most patients describe the injections as tolerable, and the near-neutral pH helps limit stinging.
Does a 3-session series mean three rounds of downtime?
The usual starting plan is three sessions about 4 weeks apart. Some protocols use a session, then a 2-week gap, a second session, a 6-week gap and a third session. After that, maintenance every 6 to 12 months is common.
Each session brings the same short 1 to 3 day reaction window. The Laetigen side effects do not build on each other, so a three-session series means three brief recovery periods, not a longer, cumulative one.
Aftercare That Shortens Laetigen Recovery
Good aftercare will not stop every bruise, but it can shorten how long Laetigen side effects last and protect the collagen you have just received.
First 1–2 days
- Wash your face and apply makeup gently, starting from the next day.
- Do not rub, scratch or press the treated area, even if the small bumps are tempting to smooth out.
First week
- Avoid heavy drinking, saunas and jjimjilbang (Korean bathhouses with hot rooms), hot baths and intense exercise. Heat and a raised heart rate can prolong swelling and bruising.
- Skip scrubs and chemical peels.
- Stay out of strong, direct sunlight.
After the first week, keep using a moisturiser or repair cream regularly and apply sunscreen every day. UV exposure breaks down collagen, so sun protection helps you keep the result longer.
Combining Laetigen with other treatments safely
Laetigen can usually be combined with Ulthera (focused ultrasound lifting), Soprano Titanium (a three-wavelength diode laser, not a radiofrequency device), Botox and fillers. The order and spacing depend on your skin, so we decide them case by case. You can read more about combining Soprano Titanium and Ulthera.
How Long Does Laetigen Last Compared With Its Side Effects?
Weighing downtime against results is a fair way to decide if a treatment is worth it.
One session vs a full series
In our clinic experience, one Laetigen session typically lasts about 4 to 6 months, and three or more sessions can extend results to 12 months or longer. These figures reflect clinical practice rather than published trial data. In practical terms, you trade 1 to 3 days of minor Laetigen side effects per session for several months of firmer, more hydrated-looking skin.
Compared with collagen stimulators
Rejuran (polynucleotide) and Juvelook (PDLLA) work differently: they prompt your own skin to build collagen, which typically takes 2 to 4 weeks or more to show. Laetigen supplies collagen directly. For details, see how Rejuran and Juvelook stimulate collagen and how Laetigen compares with Re20.
Laetigen Side Effects: Frequently Asked Questions
How long do Laetigen side effects last?
Most Laetigen side effects settle within 1 to 2 days. Swelling can last up to 3 days, bruising 3 to 7 days, and redness usually fades within a few hours to a day.
What are the small bumps after a Laetigen injection?
This is called embossing: small, grain-like bumps at each injection point where the collagen sits in the dermis. They flatten and absorb within 1 to 2 days. Avoid pressing or massaging them.
When can I wear makeup or go back to work after Laetigen?
Most people go back to work the same day or the next. Gentle makeup is fine from the next day, and concealer can cover a bruise. Avoid saunas and intense exercise for one week.
Can you be allergic to Laetigen?
Laetigen is a porcine-derived atelocollagen, so avoid it if you are allergic to collagen or pig-derived ingredients. Textbook figures on delayed collagen sensitivity come from bovine collagen, not Laetigen. Contact the clinic if redness or lumps appear later.
Why should I wait a week before an important event?
Bruising is the slowest reaction to fade and can take 3 to 7 days. A one-week buffer covers even the longest of the common reactions, so you can attend your event without worrying.
Is it safe to get Laetigen while pregnant or breastfeeding?
No. Pregnancy and breastfeeding are listed contraindications. We recommend postponing Laetigen until after you have finished breastfeeding.
Ask Dr. Lee About Your Personal Side-Effect Risk
Laetigen side effects are, for most people, a day or two of small bumps and redness, sometimes a bruise that fades within a week. Your own risk, however, depends on your skin, your medications and your history of allergies or keloid scarring.
At your consultation, we assess your skin and review those factors before recommending a plan. You can explore our anti-aging skin treatments at MINE, or call us on +82-2-516-1175 to arrange an online consultation.
※ This content is for informational purposes only and does not replace professional medical advice, diagnosis, or treatment. Individual results may vary, and side effects may occur. Please consult with a board-certified plastic surgeon for personalized advice.
