This is how cold plasma works on bacteria
The reactive species generated by plasma can interact with cells in different ways. The effects are physical (e.g. recombination or excitation of excited molecules/atoms at the surface) or chemical (e.g. hydrogen denaturation by interaction of hydroxyl radicals). In prokaryotic cells, this directly results in destruction of cellular macromolecules, including DNA, and the microorganism is inactivated. On the other hand human eukaryotic cells are much better protected and thus are not damaged by the plasma care® treatment.
The patient is neither exposed to radiation nor does electricity flow through the skin. You can find more about plasma technology under “Technology”