Phlebolysis is an electrophysical therapeutic method in which heat is generated in the body tissues by high-frequency electricity. During the phlebolysis, heat will be produced under the skin surface. The very high-frequency electromagnetic waves transmit the needed energy between two electrodes.
Increasing the internal energy leads to the physical process of heat generating. The charges, carriers of the molecules, are following the high-frequency field with a certain delay, resulting the increase of the internal energy in the material and thus its temperature. The effect of this type of heating can be seen in the imaginary part of the complex permittivity of a skin at a given frequency. When the frequency is increased, the skin works as a barrier, by reducing the penetration of the electromagnetic field, it prevents heating the deeper or inner layers.