Apparatus 10 has breachable flow conduit 12 for discharging stored fluid 12F contained in storage chamber 10C out to the ambient. Where the housing and the LEDs are configured to have direct contact with the skin or tissue of the user without any intermediary materials, and light the surface and underlying layers of tissue for photodynamic stimulation of the cells. The auxiliary lens assembly has extensions insertable into the slots of the primary extensions. Thereby, it is able to provide an apparatus for thermal treatment using superheated steam which can be built relatively small and by which treatment time can be shortened, and further, the final carbonized material can be used as charcoal.