Is the branch of medicine dealing with the skin, nails, hair (functions & structures) and its diseases, It is a specialty with both medical and surgical aspects. A dermatologist is specialist doctor that manages diseases, in the widest sense, and some cosmetic problems of the skin,
High-intensity focused ultrasound (HIFU) is a relatively new cosmetic treatment for skin tightening that some consider a noninvasive and painless replacement for face lifts. It uses ultrasound energy to encourage the production of collagen, which results in firmer skin. HIFU was then approved by the Food and Drug Administration (FDA) in 2009 for brow lifts. The device was also cleared by the FDA in 2014 to improve lines and wrinkles of the upper chest and neckline (décolletage). HIFU uses focused ultrasound energy to target the layers of skin just below the surface. The ultrasound energy causes the tissue to heat up rapidly.
Once the cells in the targeted area reach a certain temperature, they experience cellular damage. While this may seem counterintuitive, the damage actually stimulates the cells to produce more collagen - a protein that provides structure to the skin.
The increase in collagen results in with fewer wrinkles. Since the high-frequency ultrasound beams are focused on a specific tissue site below the skin's surface, there's no damage to the upper layers of the skin and adjacent issue. HIFU may not be appropriate for everyone. In general, the procedure works best on people older than 30 with mild-to-moderate skin laxity.
People with photo damaged skin or a high degree of loose skin may need several treatments before seeing results.