When you think of acne and other skin condition treatments, your first thought may not be photodynamic therapy (PDT), also known as light therapy. WHAT IS PHOTODYNAMIC LIGHT THERAPY? PDT is a non-invasive therapy that uses multiple sessions of light treatments in conjunction with a photosensitizing agent. The photosensitizing agent, such as 5-aminolevulinic acid (ALA or Levulan), is […]