Radiofrequency Face Treatment Side Effects, From Common to Rare
Redness and warmth first, then the rare ones: what the literature reports, what depends on the settings, and what we tell you before we start.
You've been told no for a laser because your skin is deep, or you've read that a laser can leave dark marks. To firm the face, XERF radiofrequency works differently: it doesn't target melanin, and the clinic states that it suits all skin types.
Heat is still heat, though. This article explains what changes compared with a laser, what the studies cover, and what they don't cover yet.
Why a laser can mark deeper skin
Many lasers target a pigment. In hair removal, it's the melanin in the hair; for a spot, it's the melanin in the spot. On deeper skin, the surrounding skin also holds a lot of melanin, and it absorbs part of the energy.
That explains the careful settings, and sometimes the refusal: the skin heats where it wasn't meant to, and a dark mark can appear after the treatment.
What radiofrequency heats instead
Radiofrequency isn't light. It passes a current through the skin, and the tissue's resistance is what produces heat. Skin colour therefore doesn't decide where the energy goes.
| What matters | Pigment-targeting laser | Radiofrequency (XERF) |
|---|---|---|
| What absorbs the energy | Melanin | Tissue, based on its resistance |
| Role of skin colour | It absorbs part of the energy | It doesn't steer the energy |
| What still needs watching | Surface heat, dark marks | Surface heat |
| Needles | Depends on the device | None |
According to the manufacturer (Cynosure Lutronic), XERF combines built-in surface cooling with a reading of the skin's resistance at every pulse. That is what keeps the heat deep.
What the literature actually reports
The facial monopolar radiofrequency studies we read mostly cover medium skin types:
- a 2025 pilot study (Suh et al.): 32 people, skin types III to V, three small burns that healed without dark marks;
- a 2026 study (Kim et al., another device): 26 people, skin types III and IV, no burns and no dark marks.
We found no solid study of facial monopolar radiofrequency on skin types V and VI. We'd rather say so: no reported problems is not the same thing as evidence on those skin types.
Radiofrequency doesn't target melanin. Published studies, for their part, have looked very little at the deepest skin tones so far.
What holds true for every skin type
Any skin can react to poorly dosed heat. Deeper skin sometimes darkens after irritation: that is why we stay careful, even with no pigment targeted. Three habits guide us, for every skin:
- the energy is raised step by step, based on what you feel;
- we don't pass over the same spot again and again;
- irritated or tanned skin waits.
A medical esthetician sets the depth and intensity. A session lasts 90 min, for the full face and neck.
With or without needles: not the same risk
Microneedling radiofrequency makes tiny punctures to deliver heat. On skin that marks easily, each puncture is one more small injury. XERF heats through the skin without piercing it.
The article monopolar or microneedling radiofrequency compares the two in detail. If you have brown spots you'd like treated, that's a separate question, covered on the pigment spots page.
What we look at during the assessment
Before a first session, we ask the questions that matter for your skin:
- has a dark mark ever followed a treatment, a scratch or a breakout?
- any recent sun exposure?
- is your skin irritated right now?
- any medications or recent facial treatments?
No downtime: back to your usual activities the same day. Temporary redness is possible, and it sometimes shows less on deeper skin. A session is $1,500, taxes extra, and the 3D analysis is offered at no charge if you'd like it. The full details are on the XERF page.
Questions we are asked
Can radiofrequency leave me with dark marks?
It doesn't target melanin, which lowers that risk compared with a laser that does. Poorly dosed heat can still irritate the skin, and deeper skin can mark after irritation. That's why we adjust step by step.
I've had a dark mark after a treatment before: can I have XERF?
Mention it at the assessment. It doesn't close the door, but it changes how we raise the energy, and we'll tell you if we recommend waiting.
Do the settings change with skin colour?
Colour doesn't steer the energy. The settings follow what the device reads at each pulse and what you feel.
Is it the same with needles?
No. Microneedling radiofrequency pierces the skin, and each puncture can mark sensitive skin. XERF has no needles.
Should I avoid the sun beforehand?
Tanned or irritated skin waits before a heat treatment. The team gives you sun guidance based on your skin.
Sources
- Suh DH, Lee SJ, Song KY, Yang H, Chae SJ, Ryu HJ. Evaluation of Improvement in Skin Laxity and Oiliness After Monopolar Radiofrequency Treatment: A Pilot Study Utilizing Multiple Assessment Tools. Journal of Cosmetic Dermatology, 2025;24(10):e70463. PubMed Central
- Kim J, Sung K, Park Y, Yi KH. Facial contour modulation and skin tightening using 40.68-MHz unipolar radiofrequency. Lasers in Medical Science, 2026;41(1):163. PubMed Central
- Cleveland Clinic. Radiofrequency (RF) Skin Tightening. my.clevelandclinic.org
- Cynosure Lutronic (manufacturer). XERF. cynosure.com/xerf
