A series of experiments on skin modification with a laser beam with a wavelength of 1560 nm and a diameter of 200 and 600 μm were conducted. Threshold values of laser radiation power, which causes the denaturation of skin collagen, were established. Using an integrating sphere and a thermal imager the optical and thermophysical parameters of the tested samples used were determined. These parameters were used to calculate both the light and temperature fields. It was shown that it is necessary to take into account the light scattering coefficient and the scattering anisotropy factor when calculating the dynamics of the temperature field in the skin. Keywords: temperature field, fractional photothermolysis, Monte Carlo methods, laser radiation, skin.