Methods are disclosed for administering electromagnetic radiation (EMR), which may include filtering EMR from part of the EMR spectrum while allowing passage of EMR at a desired wavelength. A fluorescent component may be included, which absorbs EMR at one wavelength and emits EMR at the desired wavelength. Uses may include the treatment of acne. Pruritus may also be treated by allowing the passage to the skin of a particular UV wavelength from sunlight, which has an immunosuppressive effect, while protecting the skin from other harmful UV radiation.
