Erbium-Yag laser: its wavelength (2940 nm) has a percentage of water absorption sixteen times greater than that of CO2, therefore, has a lower penetration level and with an ablative capacity which varies between 2/3 micron/J/cm2 per pulse compared to the 20/30 µ of CO2. Therefore short pulses are able to affect extremely thin layers of skin tissue. Among the numerous advantages there is the possibility to vary the depth of ablation as needed, even for small skin growths, the absence or less need for anaesthesia, the minimal thermal damage, the scarcity of side effects and fast healing times. The disadvantages, on the other hand, refer to the complete lack of induced coagulation. Due to its minimal invasiveness, multiple sessions are required to obtain good cosmetic results. It is particularly suitable for soft-resurfacing of the face, neck, décolleté, which regenerate dermal collagen and the extracellular matrix of the epidermis. It induces a clear improvement in wrinkles and fine lines, a steady increase in skin elasticity, the micronisation of the pores due to the decrease in sebum production, an increase in skin smoothness by induction of cell turnover by means of fine tissue ablation.