High Intensity focused Ultrasounds (HIFU) is a novel therapeutic method for local hyperthermia and mechanical action on the tissue.Dermatology and Plastic surgery have innovated in using HIFU combined or not with cold laser to treat under the dermis a precise target the skin laxity or to rebalance the fat volume dispatch on ageing patients. Many studies show safety and efficiency in rejuvenation, skin lifting and fat contouring.