Sensitive and dry skin can in some cases be irritated by microcurrent applications. Please use a damp cotton cloth under the electrodes; this ensures optimum conductivity. Please also make sure that the electrodes are in good contact with the skin, and reduce the intensity of the program if necessary. It is important for the effect of microcurrents that current is flowing. You can check whether current is flowing: If the circle on the screen showing the progress of time is white, then current is flowing - if no current is flowing, this circle is black.