Thermal damage to the dermis induces the activation of fibroblasts, with the consequent formation of neocollagen.
The synthesis and reorganization of type I and III collagen fibers, while the elastic fibers, although in smaller quantity, are more ordered. The wavelengths that best achieve these effects are in the 515 range. Longer wavelengths are absorbed by water in the dermis, triggering a cytokine-mediated reaction that stimulates neocollagen synthesis. The shorter wavelengths are absorbed by melanin and oxyhemoglobin present in pigmentation and telangiectasias associated with the aging process. Therefore, all the visible elements of aging (fine wrinkles, laxity, telangiectasias, irregular pigmentation) are improved with a lower rate of adverse effects and faster recovery.