XERF is a next-generation non-invasive skin-tightening treatment developed by Cynosure Lutronic. It is the world’s first multifrequency monopolar radiofrequency system, designed to deliver controlled heat to multiple layers of the skin in a single session. By combining two frequencies — 6.78 MHz and 2 MHz — XERF can target both the superficial dermis and deeper structural layers, including areas close to the SMAS (the same layer surgeons address during a facelift). This dual-