... . When RF waves penetrate the skin, it causes collagen fiber to heat up to 45 °C -65 °C, the collagen fibers immediately ... of dermal collagen hyperplasia gradually promote cellular rejuvenation, so as to achieve the purpose of firming and reduce wrinkles. 3. IPL ... (3). Relax muscles, relieve muscle spasms, relieve muscle pain (4). To tighten muscles of the arms, legs, thighs, buttocks, lower back ...