Carboxytherapy Side Effects: What Is Expected and What Is Not

You have pressure, red dots or a bruise after carboxytherapy and want to know when this is expected and when to seek help. Reported reactions to injectable carboxytherapy include pain at the injection sites, redness, temporary swelling, a crackling sensation under the skin from gas and bruising. Studies generally described these effects as transient, but their severity and duration vary. Increasing pain, skin that becomes hot and progressively red, fever or rapidly worsening swelling must not be dismissed as “normal CO₂ action”.

First establish what procedure you actually had. Injectable carboxytherapy uses a needle to deliver medical carbon dioxide; topical “needle-free carboxytherapy” uses a gel or mask. With the latter, skin irritation or reaction to ingredients is more relevant than bruising from punctures. The name is shared, but the risks must not be conflated. This article focuses on injections and cannot diagnose an individual symptom remotely.

Which reactions might be expected, and which need assessment?

What you notice	How to interpret it	What to do
Brief pain, pressure or stretching at injection sites	Reported during and after injections; tolerance differs and some people stop the course because of pain.	Tell the clinician how severe it feels; seek medical assessment if the pain worsens instead of easing.
Mild local redness, limited swelling or bruising	These can follow needle punctures and are often temporary, but no precise duration is guaranteed safe for everyone.	Watch the trend; spreading redness, warmth or worsening general health needs medical evaluation.
Crackling or crunching felt with light touch	Studies describe crepitus, a crackling feeling associated with gas in tissue. Sensation alone cannot identify precisely where the gas is or confirm that recovery is normal.	Do not massage or try to squeeze gas out; seek assessment if it persists, spreads or is accompanied by marked pain.
Growing redness with warmth, swelling and tenderness; discharge or fever	Possible signs of infection or another complicated reaction.	Contact a medical professional promptly; seek urgent care if the condition deteriorates rapidly.
Changes in vision, sudden severe eye pain, rapidly growing swelling near an eye; breathing difficulty, chest pain or fainting	Unusual potentially dangerous symptoms, regardless of what caused them.	Seek emergency medical help immediately; do not wait for a reply from the cosmetic practitioner.

This table helps decide the next action, not diagnose a condition. If a symptom seriously worries you, contact a medical professional rather than trying to infer its “normal duration” from other people's photographs.

Why can the pain be greater than expected?

Injected gas temporarily expands tissue, causing a needle prick, burning and pressure. Discomfort depends on sensitivity, the area and procedure parameters. Delicate periorbital skin and large body areas do not feel alike. In a randomised study of 78 women undergoing carboxytherapy for cellulite, two vibratory devices did not reduce pain compared with treatment without them. That result concerns the studied method and body area, not every pain-control option or the area around the eyes.

In a 2026 observational study around the eyes, 25 of 78 people who started did not complete the seven-week course because of discomfort. This is not a general dropout rate for every procedure and centre, but it illustrates why “almost painless” should never be guaranteed. You can ask to stop the injection at any point. Severe pain is not proof that treatment works and is nothing to be ashamed of.

If pain fails to ease, throbs, or accompanies a colour change, growing swelling or weakness, inform a medical professional. Do not independently start painkillers or “bruise-dissolving” products without understanding your contraindications or the cause of the symptoms. The priority is to establish whether the reaction fits the treatment actually performed.

Bruises, swelling and red dots: planning ordinary life

Needle punctures can leave tiny marks and bruises. Feeling medically well enough to go about your day is not the same as looking unaffected. If you appear on camera, meet clients or have an important event, even a small under-eye bruise can matter. Allow an uncertain buffer instead of relying on “nothing will show tomorrow”.

On treatment day, ask for written individual aftercare advice about cleansing, makeup, exercise, saunas and touching the area. Fixed hourly restrictions on advertising pages do not replace advice based on examination. While punctures or irritation remain, avoid strong exfoliating acids and rubbing the sites unless the clinician says otherwise.

Symptoms becoming progressively milder is more reassuring than pain, heat and swelling that keep increasing, but improvement does not absolutely exclude a problem. If uncertain, take a neutral photo under consistent lighting, note when the symptom began, and contact the treating clinician or another qualified professional. For emergency signs, seek help immediately rather than waiting for a message reply.

Which other complications should not be overlooked?

Breaking the skin creates an entry point for infection if aseptic technique fails. This is why sterile single-use needles and syringes, suitable skin preparation, sterile medical-grade gas and a properly handled delivery system matter. The CDC emphasises basic injection safety, including never reusing needles or syringes between patients. Asking how these requirements are met is entirely appropriate.

Dermatology reviews describe gas persisting in subcutaneous tissue (subcutaneous emphysema) and unintended changes to subcutaneous fat; reliable rates cannot be calculated from the heterogeneous available studies. Medical CO₂ is not “completely safe in every situation” merely because the body naturally produces carbon dioxide. Route, volume, anatomical area and the person's health are all relevant.

Redness, local warmth and pain, particularly alongside fever or malaise, require assessment to rule out skin or soft-tissue infection. The UK's NHS advises prompt evaluation of painful, hot and swollen skin. Severe systemic illness or rapid deterioration calls for emergency care. Unusual symptoms around an eye deserve particularly prompt assessment because of the sensitive anatomy.

Who should discuss risk especially carefully before treatment?

Good large safety studies in people with many medical conditions and medications are lacking. A literature review lists conditions in which carboxytherapy should be avoided or considered with particular caution: severe cardiovascular, respiratory, renal or liver disease; thrombosis; uncontrolled hypertension; active infections and fever. That review is not a personalised clinical protocol, and these diagnoses do not all carry identical risk at every stage. Do not withhold your medical history.

Pregnant or breastfeeding people have generally been excluded from relevant study populations; research available through October 2026 does not reliably establish the safety of elective CO₂ injections in these circumstances. Postponing an unnecessary cosmetic procedure and discussing the situation with your doctor is sensible. Tell the clinician if you take anticoagulants or antiplatelet medicines or bruise or bleed unusually easily. Never stop prescribed medication yourself just to have injections.

An active infection or broken skin at the treatment site needs examination and consideration of postponement. Near the eyes, first check whether inflammation, allergy or another condition needs different care. With a topical mask, report allergies and reactions to specific ingredients; avoiding needles does not make every product suitable for everyone.

Seven specific safety questions before consenting

Will this involve injections or a topical CO₂ gel? Precisely where and how will it be used?
Which reactions are expected in my area, and what symptom should prompt me to contact you the same day?
Who will perform the treatment, and do they have training for that particular anatomical area?
How are medical-gas sterility, single-use equipment and safe operation of the delivery system verified?
Which of my conditions, medicines and recent treatments could change the decision?
Whom should I contact at night or on weekends if I develop unusual pain or swelling?
Is there a less invasive way to address my concern, or can I reasonably choose no treatment?

If no one explains the limits of a normal reaction, you are told to endure severe pain, or “zero risk” is promised, declining and seeking a second opinion is reasonable. Watchful waiting or another approach is a valid choice. For interpreting visible results rather than urgent symptoms, see the separate before/after article; here the priority is symptoms and what not to delay. Before/after

Additional questions

Can a skin patch test check sensitivity to injected CO₂?

A conventional test for a cosmetic product cannot establish tolerance of injected gas and skin puncture. Discuss medical risk factors, technique and reactions to previous procedures instead.

If the first session caused a bruise, will it always happen again?

No. A repeat is not inevitable, though a new puncture still carries bruising risk. Tell the clinician how extensive it was and which medicines you take.

If my friend had no complications, does that mean it is safe for me?

No. Anatomy, medical conditions, medicines, procedure details and practitioner differ. Her good experience cannot substitute for an individual assessment and informed consent.