The most common side effects of Thermage FLX are mild redness, warmth and slight swelling that usually settle within hours to a day. Less common effects include tenderness, temporary bumps or small blisters, and rarely burns or surface irregularities. At Re:berry Hongdae, a doctor assesses suitability first, and responses vary by individual.
Re:berry Clinic Hongdae · Information reviewed for accuracy · Results vary by individual.
What is Thermage FLX?
Thermage FLX is an FDA-cleared radiofrequency device that heats the dermis while cooling the skin surface. The heat is associated with collagen contraction and remodeling, which may make skin look firmer and smoother over two to six months.
What side effects are common?
- Redness: usually fades within a few hours.
- Warmth and mild swelling: typically settle within a day.
- Tenderness: the skin may feel sensitive to touch for a day or two.
Most people return to normal activities immediately. Avoid saunas, alcohol and intense exercise for the rest of the day.
What side effects are less common or rare?
- Small bumps or a grid-like imprint from the treatment tip that fades within days
- Temporary numbness or tingling
- Small blisters or crusts
- Rarely, burns, dents or surface irregularities, often linked to excessive energy or poor contact
Tell the clinic promptly about blisters, persistent pain or skin changes.
Does Thermage hurt?
Most people feel short bursts of deep heat, each followed by cooling and vibration from the handpiece. Numbing cream is often used. Discomfort tends to be stronger over bony areas such as the jawline and forehead. Tell the practitioner if a pulse feels too hot, because energy levels can be adjusted during treatment.
Does Thermage cause fat loss?
This is a common concern. Thermage mainly targets the dermis, and when used with appropriate settings, significant fat loss is not expected. However, people with very thin or low-fat faces should discuss this risk, and the doctor may adjust the plan. Read is Thermage FLX painful for comfort details.
Who should avoid Thermage?
- Pregnancy
- Pacemakers or implanted electronic devices
- Active infection or open wounds in the area
- Some metal implants near the treatment area
How can I lower my risk?
Choose a clinic where a doctor plans the treatment, confirm genuine treatment tips, and disclose your medical history and recent treatments, especially filler. Follow the Ultherapy and Thermage aftercare guide. Book via our Booking page; pricing depends on shot count and is confirmed in writing at consultation.
At a glance
- Device: Monopolar radiofrequency, FDA-cleared
- Common: Redness, warmth, mild swelling for hours to a day
- Less common: Tenderness, bumps, small blisters
- Rare: Burns, dents or surface irregularities
- Downtime: Usually minimal
- Not suitable: Pregnancy, pacemakers, some implants
Related questions
How long does redness last after Thermage?
Redness after Thermage FLX usually fades within a few hours, and mild swelling typically settles within a day. Some people with sensitive skin may stay slightly pink a little longer. Makeup is often possible the same or next day unless your doctor advises otherwise.
Can Thermage be done around the eyes safely?
Thermage FLX has an eye-specific tip designed for the eyelid area, used with protective eye shields. It is commonly used for crepey eyelid skin. Suitability depends on your anatomy and eye health, and the doctor will explain the specific precautions before treatment.
Is it safe to do Thermage after filler?
Many doctors prefer to perform Thermage before filler or to wait a few weeks after filler in the same area, though protocols vary. Tell the doctor exactly what filler you have and when it was placed so timing and settings can be planned safely.
Keep reading
Before you book
This page is general information, not a diagnosis. Suitability, dose, number of sessions and expected results are decided by a doctor at consultation, and results vary by individual. Possible side effects include redness, swelling and bruising. Pricing is confirmed in writing before any treatment. See our medical disclaimer.
Still have a question?
A doctor at Re:berry Clinic Hongdae can answer it for your skin specifically. Multilingual consultation support is available.