In short. What a session actually involves, how the heat is watched while it is delivered, why your report is part of the control, and what the marks afterwards mean.
Key points
- Say when it is too hot, and say it early.
- The treatment works close to the temperature at which skin is injured, which means the margin between an effective pass and a burn is set partly by your report.
- Nobody is being brave by enduring a pass in silence, and a practitioner who seems to want you to is telling you something about how the rest of the plan is likely to go.
A session is shorter and duller than most people expect: no anaesthetic in the usual case, no theatre, no recovery to speak of, and twenty to sixty minutes during which the skin is heated in passes and someone is watching it.
Before the handpiece
The session begins with the things that decide whether it is safe. Your history is reviewed for implants, metal, medication and any previous treatment in the area. The skin is examined and photographed in standard light, because the change is judged against your own earlier photograph rather than against memory. Any active breakout, cold sore or broken skin postpones the session.
During the session
The area is prepared, the handpiece is moved across the skin in overlapping passes, and the skin is cooled as it goes. You feel heat building — warm, then hot, then uncomfortable at the end of a pass. The person treating you watches the skin and asks what you feel, because the two together set the endpoint of each pass. Some practices measure skin temperature as a second check; the reading and your report work together, and neither is sufficient alone.
Your one job in the room
Say when it is too hot, and say it early. The treatment works close to the temperature at which skin is injured, which means the margin between an effective pass and a burn is set partly by your report. Nobody is being brave by enduring a pass in silence, and a practitioner who seems to want you to is telling you something about how the rest of the plan is likely to go.
What you leave with
The skin is red and hot and feels like mild sunburn for a few hours, less often for a day or two. Swelling is mild and settles within the day, and lines from the handpiece fade over hours. A blister or a graze is different: it means the skin was heated past what it tolerates where the handpiece paused too long, and it should be reported and reviewed.
Afterwards
Normal activity resumes the same day and exercise within a day or two. Sun protection matters for weeks, because pigment change after a heat injury is more likely in exposed skin. The part most patients find hardest is that nothing looks different yet, and that is expected: the surface settles over a week or two, firmness to the touch often arrives in the first month, and the face is judged at the review.
Stop the session and ask for review if
- A pass feels sharply painful rather than hot, or the pain does not ease when the handpiece moves on.
- The skin blisters, breaks, or turns white or grey during the session.
- You feel faint or unwell, or your vision changes.
How many sessions a series runs to, and how far apart they sit, is set out in How Many Sessions, and How Far Apart. What the days afterwards normally look like is described in Burns, Contour Dips and the RF Risks That Matter.
Frequently asked questions
Does the session hurt?
It is warm, then hot, then uncomfortable at the end of a pass, and the discomfort rises and falls with the movement rather than staying constant. Most people describe it as tolerable and tiring rather than painful. A pass that feels sharply painful rather than hot is not a pass to endure, and the session can be stopped.
How long does a session take, and can I go back to work after?
A facial session usually runs under an hour in the chair. Redness that feels like mild sunburn lasts a few hours, less often a day or two, and most people return to ordinary activity the same day. Some prefer not to be flushed at a meeting on the day itself.
What are the lines on my face afterwards?
They are marks from the handpiece and they fade over hours. A blister or a graze is different: it means the skin was heated past what it tolerates where the handpiece paused too long, it is not a normal part of recovery, and it should be reported and reviewed rather than dressed at home.
Risks & Limitations
- Heat injury is the characteristic risk: a burn or blister where the skin was heated past what it tolerates, usually where the handpiece paused too long in one place. Blistering is not a normal part of recovery and should be reviewed rather than dressed at home.
- Fat beneath the skin can be reduced by heat, producing a hollow or contour dip rather than a tightening. It usually appears weeks to months later, it is the hardest of the risks to correct, and the fat that has gone does not return.
- Pigment can darken or lighten after treatment, and lightening where pigment cells have been injured is not reliably correctable. Skin that tans easily carries the greater risk.
- Tightening is not lifting. The support beneath the skin is not repositioned, nothing delivered through the surface removes skin, and the change is modest and not permanent.
When to Seek Care
- Blistering, broken skin, or a burn that is not settling after a few days.
- A hollow or contour dip that appears in the treated area weeks after a session.
- Skin turning white, grey or dusky during a session, or pain that is sharp rather than hot.
- Increasing pain, warmth, redness or swelling in the treated area, or fever after treatment.
References & Further Reading
- American Society of Plastic Surgeons (ASPS) — procedure and safety guidance
- National Institute for Health and Care Excellence (NICE, UK) — relevant guidance
- Cochrane Library — systematic reviews
- Chinese Medical Association Plastic Surgery Branch — clinical guidance
This page is patient education, not medical advice, and it does not cite individual studies. Discuss your own case with a qualified clinician. To arrange an assessment at Chongqing West District Hospital, see Contact & Consultation.