contour injection side effects
Understanding Contour Injection Side Effects for Safer Treatments
In Korea, “contour injection” (윤곽주사) usually means a fat-dissolving injection for the face, most often the jawline, the area under the chin and the cheeks. This page covers the side effects of those injections: which ones are expected, and which need urgent care.
Common Side Effects of Contour Injections
Risk Factors Influencing Side Effects
Managing Swelling and Bruising After Treatment
Signs of Serious Complications to Watch For
Preventive Measures for Safer Facial Contouring
When to Seek Medical Advice Post-Injection
What are the typical side effects of contour injections and how can they be managed?
Swelling, bruising, pain, numbness, redness and firmness at the injection sites are the usual effects. Swelling can be marked in the first few days and often takes one to two weeks to settle. Cold compresses and avoiding heat, alcohol and hard exercise for a few days are the usual advice.
Common Side Effects of Contour Injections
In Korean clinics, contour injections are usually fat-dissolving injections rather than fillers. Formulas vary by clinic. The only fat-dissolving ingredient approved by the MFDS is deoxycholic acid, and the approved products cover moderate to severe fat under the chin in adults; injecting the jawline or cheeks, and the mixed “cocktail” formulas many clinics use, is off-label. In the US trials of a deoxycholic acid injection, 87% of treated patients had swelling, 72% bruising, 70% pain and 66% numbness at the injection site.
Deoxycholic acid breaks down fat-cell membranes, and the body clears the damaged cells over the following weeks. That process causes inflammation, which is why swelling and firmness are expected rather than a sign that something has gone wrong. Some clinics also use the name for filler shaping of the jaw or chin, so ask which product is being injected; filler carries a different emergency risk, covered in the warning section below.
Knowing which effects are expected helps you plan recovery, particularly around a trip. For what the treatment involves and who it suits, see our page on contour injection face.
Risk Factors Influencing Side Effects
Several factors affect how much swelling and bruising you get. Areas with more blood vessels and thinner skin bruise more easily. The deoxycholic acid label notes that bruising is frequent and advises caution in people taking antiplatelet or anticoagulant medicine, or with clotting problems. The amount injected and the number of injection points per session also matter.
Medical history matters too. Tell the clinic about blood thinners, supplements such as fish oil, clotting disorders, diabetes or other conditions that slow healing, and any difficulty swallowing, which the label lists as a precaution. Smoking can slow healing.
Where and how deep the injection goes matters most. Injections that are too shallow can damage the skin (the label warns of ulceration), and injections near the jawline can injure the marginal mandibular nerve, which moves the lower lip. The approved area is under the chin only. In September 2026 the US FDA strengthened its warnings after reports of nerve problems, blurred vision and long-lasting lumps when deoxycholic acid was used in unapproved areas, including near the eyes.
Managing Swelling and Bruising After Treatment
Managing swelling and bruising after contour injections is mostly about simple, early steps. Cold compresses in the first day help limit swelling and bruising; short, gentle icing sessions are the usual advice, and the clinic can tell you how often.
Sleeping with the head slightly raised can reduce puffiness. Avoid hard exercise and heat, such as saunas or sunbathing, for a few days. For pain, acetaminophen (paracetamol) is usually preferred, because NSAIDs such as ibuprofen can increase bleeding.
If bruising appears, it usually fades over one to two weeks, like any facial bruise. Arnica gel and vitamin supplements are often suggested, but the evidence that they speed healing is limited, so treat them as optional.
Signs of Serious Complications to Watch For
Some symptoms are not normal. Difficulty swallowing, an uneven smile or trouble moving the lower lip (a sign of nerve injury), skin over the injection area that turns dark, blisters or breaks down, spreading redness with heat or fever, and any change in vision should be reported to the clinic the same day. In the US trials, the nerve injuries that occurred all recovered on their own, over a median of 44 days.
If filler was used rather than a fat-dissolving injection, the emergency to know about is a blocked blood vessel. Signs appear during or soon after the injection: sudden severe pain, skin that turns pale and then blotchy purple, or any change in vision. Filler in a blood vessel can cause skin death and, rarely, blindness, which can be permanent. Hyaluronic acid filler can be dissolved with hyaluronidase, which works best when given quickly, so go straight back to the injecting clinic or to an emergency department.
Normal swelling improves day by day; a complication usually gets worse or brings new symptoms. Firm lumps can also persist after deoxycholic acid: the FDA review found nodules lasting about five months on average after off-label use. When you are unsure, an early check at the clinic is the safest course.
Preventive Measures for Safer Facial Contouring
Reducing your risk
Choose a qualified practitioner
Ensure the injector has specialized training and experience in facial anatomy to minimize injection errors.
Disclose medical history
Inform your provider about medications, allergies, and health conditions that might affect healing or increase risks.
Avoid blood-thinning substances
Ask whether to pause aspirin, other NSAIDs, alcohol and supplements such as fish oil before treatment. Never stop a prescribed blood thinner without your own doctor’s advice.
Prepare skin properly
Cleanse thoroughly and avoid harsh skincare products before the procedure to lower infection chances.
Follow post-injection care instructions
Adhere to recommended cold compress application, activity restrictions, and hygiene practices to support recovery.
Mention these at the consultation, as they can rule treatment out or change the plan: pregnancy or breastfeeding, infection at the injection site (a listed contraindication for deoxycholic acid), difficulty swallowing, bleeding disorders or blood thinners, and allergy to any ingredient.
When to Seek Medical Advice Post-Injection
Knowing when to call the clinic makes complications easier to manage. Seek care the same day for severe or worsening pain, vision changes, difficulty swallowing, skin that darkens or breaks down, weakness of the lower lip, or fever with spreading redness.
- Contact your provider if swelling or bruising gets worse after 72 hours or is still not improving after two weeks.
- Report any numbness, uneven areas or lumps that are still there at your next visit, so the clinic can record them before any further session.
Frequently Asked Questions
Q : How long does swelling usually last after contour injections?
a : Swelling is usually most visible in the first few days and improves over one to two weeks; under the chin it can be noticeable enough to plan around. In the approved regimen, sessions are at least one month apart, which gives swelling time to settle before the next one.
Q : Are there any permanent risks associated with facial contour injections?
a : Permanent harm is rare but possible. With deoxycholic acid, skin ulceration and nerve injury are listed risks. With filler, a blocked blood vessel can cause skin death and, rarely, permanent vision loss. An experienced injector and early reporting of warning signs reduce these risks.
Q : What should I do if I experience severe bruising after a contour injection?
a : Use cold compresses and avoid alcohol, heat and blood-thinning painkillers unless your doctor advises otherwise. Arnica has limited evidence behind it. If bruising is spreading, very painful, or comes with a dark or pale patch of skin, contact the clinic the same day.
Q : Can certain medical conditions increase the risk of side effects from contour injections?
a : Yes. Bleeding disorders and blood thinners increase bruising, conditions such as diabetes can slow healing, and existing difficulty swallowing is a listed precaution for deoxycholic acid. An infection at the injection site means treatment should wait. Give the clinic your full medical history.
Q : How can I prepare my skin before getting a contour injection to minimize side effects?
a : Arrive with clean skin and avoid harsh products on the area beforehand. Ask whether to pause aspirin, other NSAIDs, alcohol and supplements such as fish oil, and do not stop a prescribed blood thinner without your own doctor’s advice.
Key points
Understanding Side Effects and Care for Facial Contour Injections
In Korea, facial contour injections are mostly fat-dissolving injections. Deoxycholic acid is the only approved ingredient, and only for fat under the chin; use elsewhere on the face and mixed formulas are off-label. Swelling, bruising, pain, numbness and firmness are expected. Nerve injury, difficulty swallowing, skin ulceration and lumps that last for months are less common risks. If filler is used instead, a blocked blood vessel is the emergency to know about. For how these injections are offered, see fat-dissolving injections in Korea.
Typical side effects include swelling, bruising, pain, numbness, redness and firmness at the injection sites.
Blood thinners, clotting problems, the injection site and injection depth all affect how likely and how severe side effects are.
Cold compresses, head elevation, and avoiding strenuous activities help reduce swelling and bruising during recovery.
Warning signs include difficulty swallowing, lower-lip weakness, skin that darkens or breaks down, fever with spreading redness, and vision changes.
Preventive strategies involve selecting experienced practitioners, disclosing medical history, avoiding blood-thinning substances before treatment, and following strict post-injection care guidelines to minimize risks and support healing.
- Fat-dissolving injections in Korea
- Contour injection face
- InMode FX before and after
- InMode treatment in Korea
- Skin Booster Side Effects: What to Expect
Sources & Verification Notes
The figures and approval details on this page come from the sources below.
- Approval scope in Korea: the MFDS-approved fat-dissolving injections use deoxycholic acid and are approved for moderate to severe fat under the chin in adults; the mixed “cocktail” injections common in clinics are not approved products (Pharm Edaily, June 2024).
- Side-effect rates (swelling 87%, bruising 72%, pain 70%, numbness 66%), the minimum one-month interval, nerve injury recovery (median 44 days), the swallowing and bruising precautions, and infection at the injection site as a contraindication come from the US prescribing information for a deoxycholic acid injection (Kybella, 2015).
- The FDA’s strengthened warning on off-label use, including vision and nerve problems and nodules lasting about 143 days on average, was reported by Kormedi on 16 September 2026.
- Blindness after filler injection and its management are reviewed in Aesthetic Surgery Journal, 2024 (PubMed 38630871).
This guide is written for readers who are visiting or considering visiting Korea for dermatology treatment. It’s general information, not medical advice or a personal recommendation. See our Medical Disclaimer before making a treatment decision, and confirm specific details, current pricing, and suitability directly with a clinic.
Note: The clinic that treats you should give you written aftercare and a number to call if a warning sign appears.