High Quality Content by WIKIPEDIA articles! Photodynamic therapy (PDT) is a form of phototherapy using nontoxic light-sensitive compounds that are exposed selectively to light, whereupon they become toxic to targeted malignant and other diseased cells. PDT has proven ability to kill microbial cells including bacteria, fungi and viruses. PDT is popularly used in treating acne. Lately PDT has been looked upon for as a possible treatment modality for super bugs. It is used clinically to treat a wide range of medical conditions, including wet age-related macular degeneration and malignant cancers, and is recognised as a treatment strategy which is both minimally invasive and minimally toxic.