Mesotherapy : a safe technique, but not without side effects
Common side effects of mesotherapy
In most cases, mesotherapy causes transient local reactions. These are associated with the very nature of the procedure, involving the introduction of fine needles into the superficial dermal layers.
In the hours following the session, the most common observations are : localised redness (erythema), a slight feeling of warmth, small papules at injection sites (comparable to insect bites), very slight bruising, particularly on thin skin, tightness or a feeling of taut skin.
Although sometimes visible, these manifestations are neither painful nor lasting. They generally disappear within a few hours to 48 hours without requiring particular treatment. Their intensity varies according to the treated area, individual sensitivity and technique used.
Can more pronounced adverse effects occur ?
In rare cases, some patients may experience moderate adverse effects :
- Localised oedema : temporary swelling, especially around the eyes or on the lips.
- Increased sensitivity or skin discomfort, particularly if the skin is already weakened.
- A mild inflammatory reaction with repeated injections in the same area.
- Fine peeling or small spots when the skin reacts to certain components of the injected mixture.
These reactions are not complications, but rather temporary skin reactivity. They are easily controlled with soothing, hydrating care and, if necessary, longer intervals between sessions.
Is there an infection risk with mesotherapy ?
Skin infections following mesotherapy are exceptional when the procedure is performed in a medical setting with sterile, single-use equipment.
Nevertheless, a local bacterial infection can occur if the skin has not been properly disinfected, the patient manipulates or scratches the treated area after the session, or treatment is performed outside a compliant medical environment.
These infections manifest as persistent redness, increasing warmth, localised pain and sometimes discharge. They then require prompt assessment and antibiotic treatment.
Prevention relies on impeccable hygiene, rigorous asepsis and meticulous adherence to post-procedure instructions, particularly the prohibition on applying make-up or wetting the treated area during the first few hours.
Are allergic risks common during a mesotherapy session ?
Allergic reactions to mesotherapy are exceptional but must be considered. They mainly concern certain injected ingredients (vitamins, preservatives, possible lidocaine) or, more rarely, an unknown individual hypersensitivity.
Warning signs are intense itching, localised or generalised hives, persistent swelling (angioedema in severe cases) or breathing discomfort (very rare).
These cases remain extremely rare in practice, but the medical history — allergies, ongoing treatment, immune diseases — helps avoid risky situations. In some cases, a prior tolerance test may be performed.
Which serious complications might be feared ?
When correctly performed, mesotherapy is not associated with serious complications. Severe adverse effects (skin necrosis, major inflammatory reaction, deep infection) are virtually non-existent when the procedure is performed by a doctor trained in injection techniques with quality pharmaceutical products in a safe medical environment.
Complications reported in the literature generally concern treatments performed outside the regulatory framework, by unauthorised individuals or with non-compliant products.
Who is most exposed to mesotherapy's adverse effects ?
Side effects are more common in patients with reactive or sensitised skin (rosacea, eczema) ; receiving anticoagulant treatment (increased bruising risk) ; or with unstabilised autoimmune diseases.
A thorough prior discussion allows the doctor to determine temporary or relative contraindications and adapt the protocol to limit risks.
In summary : mesotherapy, a safe technique
Mesotherapy is a reliable aesthetic treatment whose side effects are most often mild, transient and fully manageable.
However, like any medical procedure, it requires technical expertise and detailed knowledge of skin anatomy, and sessions must be performed in a medical practice.
Performed by an experienced doctor with certified products and in compliance with aseptic rules, mesotherapy has an excellent safety profile.
Patient information, medical dialogue and following instructions after the session ensure a safe, effective experience.
