... , the heating effect heats up the collagen and causes the denaturalization, which is called collagen shrinkage ... RF beauty machine:2.1 Skin-tightening & Lifting and making the pore contracted Tightening the forehead, eye ... eyelid wrinkle, neck wrinkle, crow’s-feet and nasolabial line.2.3 Shaping the body Shape the arm, ... thigh, abdomen, lift and tighten the waist, ...