In short. Implanted electronic devices, metal in the treated area, pregnancy, active infection, and skin that cannot report what it feels. The reasons treatment is refused.
Key points
- Your sense of heat is part of what keeps the treatment safe: the person who can feel a pass becoming too hot is often the person who stops it going too far.
- Where sensation in the treated area is reduced — after previous surgery, after a nerve injury, or with a condition that affects feeling in the face — that protection is partly missing and the risk of a burn rises.
Most writing about candidacy lists who is suitable. The list that matters more is the shorter one, because the reasons this treatment is ruled out are not matters of degree.
Implanted electronic devices
An implanted electronic device is the clearest of them: a cardiac pacemaker, an implanted defibrillator, a neurostimulator, a cochlear implant, an insulin pump, or any other active device. Energy delivered through the skin can reach the device and interfere with it, and this is not a risk that can be managed by choosing a lower setting. Some devices can be shielded under supervision, but that is a decision for the physician responsible for the device.
Metal in the treated area
Metal in the path of the treatment is the second. Plates and screws from previous facial surgery, dental implants in the jaw, and solid implants of any kind can concentrate energy and cause a burn from the inside. This is not always a disqualification, but it is always something the practitioner has to know in advance.
Pregnancy, infection and skin that is not intact
Pregnancy and breastfeeding are reasons to postpone an elective treatment rather than to cancel it: there is no evidence of harm from this kind of energy in pregnancy, and no reason to take a risk. Active infection, open skin, a recent cold sore or an inflamed breakout over the area are reasons to wait until the skin has settled, because treating inflamed skin is one of the ways burns and pigment change happen.
Skin that cannot report what it feels
Your sense of heat is part of what keeps the treatment safe: the person who can feel a pass becoming too hot is often the person who stops it going too far. Where sensation in the treated area is reduced — after previous surgery, after a nerve injury, or with a condition that affects feeling in the face — that protection is partly missing and the risk of a burn rises.
Reasons that are about the plan rather than the skin
Two further reasons are about expectation rather than tissue. A patient who wants a result this treatment does not produce — a lift, a change that lasts without maintenance, or the removal of skin — should not begin a series, because no number of sessions reaches it. A patient who cannot attend a series spaced about a month apart, or return for the review, should wait: the plan is built on a face that is about to change.
Reasons to decline outright
- An active implanted electronic device, unless cleared by the physician who manages it.
- Metal or a solid implant in the path of the treatment that has not been disclosed and assessed.
- Pregnancy, or an active infection or open skin over the area to be treated.
What happens when these are missed is described in Burns, Contour Dips and the RF Risks That Matter, and the questions that surface these answers before anything is agreed are in Questions to Ask Before You Agree to RF Tightening.
Frequently asked questions
I have a pacemaker. Is there any way this can be done safely?
Only if the physician who manages the device clears it, and that decision is theirs rather than the practitioner offering the treatment. Energy delivered through the skin can reach an implanted device and interfere with it, and that is not a risk to be managed by choosing a lower setting on the day.
I have dental implants. Does that rule me out?
Not necessarily, but it has to be known and assessed before treatment. Metal in the path of the treatment can concentrate energy and cause a burn from the inside. Whether it can be worked around depends on where it is and what is being treated.
I am not pregnant but plan to be within the year. Should I wait?
It is worth discussing. A series runs across about half a year with a review after it, and treatment planned around a face that is about to change is treatment planned on a baseline that will not hold. Waiting costs nothing except the result you did not have.
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.