The Plasma Pen creates Plasma through electrical energy, which when placed far away enough from the skin surface ionises the atmospheric gases (oxygen and nitrogen) to create an electrical arc. When this arc comes into contact with the skin it vaporises any liquid present and the skin surrounding the area contracts, resulting in tightening. This then makes the skin appear lifted. The contracting and tightening of the skin surface is called sublimation.
During the healing process the skin vaporised by the Plasma Pen will flake off.