Radiofrequency (RF) lifting is a non-surgical procedure that uses heat generated by electromagnetic waves to penetrate deep into the skin, causing collagen to contract and stimulating the production of new collagen and elastin. The Thermage line is a well-known example of RF equipment. According to the Cleveland Clinic, the procedure works by briefly raising the temperature of the skin’s collagen layer to approximately 60–70 degrees to tighten the tissue. Changes typically appear gradually over 2–6 months, and depending on aftercare, the effects can last for about 1–3 years. Results and duration of effects vary significantly from person to person. Mild redness and swelling after the procedure usually subside within a day, but there is a rare risk of burns due to overheating, which is why the use of approved equipment and a skilled practitioner is emphasized. However, this method is generally more suitable for mild sagging in the early stages of aging; severe sagging may require surgical intervention, so it does not completely replace surgery. During your consultation, verify the equipment’s approval status and your suitability for the procedure. This information is for reference only and does not constitute a diagnosis. Please consult a specialist regarding the actual procedure.
[Source] https://my.clevelandclinic.org/health/treatments/24683-radio-frequency-rf-skin-tightening