Thermage side effects: what is normal, and what is not
Medically reviewed by Dr Sin Yong · Last reviewed · 3 min read
Main guideThermage Singapore — what it treats, who it suits, sessions, downtime and what decides the cost, by Dr Sin Yong.
After Thermage FLX, most people have redness and mild swelling that settle within hours to a day, sometimes with a faint grid pattern from the treatment tip. Uncommon problems include small burns or blisters, and contour changes when heat affects the fat beneath the skin. They are uncommon because the surface is cooled during each pulse and energy is set area by area; when they do happen, early review matters.
Illustrative image. Radiofrequency is often used where skin quality, not depth, is the main issue.
Key facts
Common, settles
Redness, mild swelling, a faint grid pattern, tenderness
How long
Hours to a day or two
Uncommon
Small burns or blisters, contour changes from fat loss, temporary altered sensation
Lower risk with
Correct cooling, coupling, energy per area and avoiding overlapping passes on thin tissue
See a doctor if
Blistering, crusting, a growing dent, or pain that worsens
Comparing lifting options beyond Thermage? For most sagging, Dr Sin Yong leads with his own protocols, the VF Lift – Vertical Facelift (monopolar radiofrequency on Volnewmer) and Time Freeze Laser LCLR® (dual-wavelength laser). Both work on your own tissue. Nothing is injected, so there is no filler to overfill, migrate or form lumps. Which one suits you, if either, is decided at assessment.
The effects most people notice
Thermage heats the dermis as a layer while the surface is cooled with cryogen spray. Redness and mild swelling are expected for a few hours, and around the eyes swelling can last a day or two. Some people see a faint grid or the outline of the tip for a short time. Tenderness is usually mild.
Illustrative image — not a patient.
Less common problems and why they happen
Small burns or blisters can occur if cooling or contact is incomplete for a pulse, or if energy is too high for that area. Contour changes, such as a small dent, can follow if heat affects the fat beneath the skin; this is more of a concern in lean faces. Altered sensation is uncommon and usually temporary.
Energy is set per area and adjusted by feedback during treatment, which is why Thermage is done by a doctor who plans the passes for each face. A heavy face after filler is a different problem altogether and is assessed separately; see pillow face.
Thermage effects at a glance: which settle on their own and which need review
The same finding can be ordinary or a warning depending on how it behaves. The table lists each effect seen after Thermage FLX, the version that settles, the version that needs a photograph and review, and why it happens.
Effect
Usually settles
Needs review
Why it happens
Redness and warmth
Pink, warm skin fading on its own after treatment
Redness that deepens, spreads or comes with pain
Dermal heating under cryogen cooling; worsening suggests incomplete cooling or contact
Swelling
Mild, more under the eyes and along the jaw, easing with cool compresses and sleeping raised
Swelling that grows after it had started to settle, or is one-sided and tender
Heat-related fluid in the tissue; eyelid skin is thin and loose, so the lids puff more
Grid or tip outline
A faint pattern from the marking paper and the tip's contact, fading with the pinkness
A grid of raised welts, blisters or crusts
Normal contact marks versus pulses delivered with incomplete cooling or contact
Tenderness
Mild, settling without treatment
Pain that increases rather than eases
Deep heating; worsening pain can mean a burn beneath the surface
Burn or blister
Not expected at all
Any blister, crust or open area, the same day
Cooling or contact incomplete for a pulse, or energy too high for that area
Contour change
Not expected
A dent forming, or a hollow appearing where there was none
Heat reaching fat beneath the skin, more of a concern in lean faces
Swelling and redness that are improving can be watched. Send a photograph if a mark has not faded after a few days, if a blister appears, or if you notice a dent forming. Burns are managed like any superficial burn, with wound care and sun avoidance, and are reviewed until healed.
Questions after treatment come back through WhatsApp at +65 8023 7170 during clinic hours (Monday to Friday 10am to 8pm, Saturday 11am to 3pm, Singapore time). Anything that is getting worse rather than better, a blister or open area, or fever needs to be seen the same day, wherever you are.
“Radiofrequency is forgiving when it is planned for the face in front of you, and less forgiving when one setting is used for everyone.”
Usually a few hours. Swelling around the eyes can last a day or two.
Uncommonly, contour changes can follow if heat affects fat beneath the skin, more of a concern in lean faces. Energy is planned per area to reduce this.
Small burns or blisters are uncommon and are linked to incomplete cooling or contact, or to energy that is too high for the area.
Radiofrequency is not absorbed by pigment in the way some lasers are, so skin colour is less of a factor; the main planning points are tissue thickness and energy per area.
It can be assessed. Bring the date, the areas and the tip used if known.
de Felipe I, Del Cueto SR, Pérez E, Redondo P. Adverse reactions after nonablative radiofrequency: follow-up of 290 patients. Journal of Cosmetic Dermatology, 2007. pubmed.ncbi.nlm.nih.gov
Fitzpatrick R, Geronemus R, Goldberg D, Kaminer M, Kilmer S, Ruiz-Esparza J. Multicenter study of noninvasive radiofrequency for periorbital tissue tightening. Lasers in Surgery and Medicine, 2003. pubmed.ncbi.nlm.nih.gov
Efficacy and Safety of Monopolar Radiofrequency for Tightening the Skin of Aged Faces. Cosmetics, 2024. www.mdpi.com
Evaluation of the Effect of Laterality and Age on Pain Perception in Monopolar Radiofrequency Facial Therapy. PubMed Central. pmc.ncbi.nlm.nih.gov
Treatment of facial skin laxity by a new monopolar radiofrequency device. Journal of Cutaneous and Aesthetic Surgery, 2011. pmc.ncbi.nlm.nih.gov
