Photodynamic therapy (PDT), sometimes called photochemotherapy, is a light therapy involving light and photosensitizers. PDT has been proven to kill microbial cells, including bacteria, fungi and viruses. PDT skin is widely used to treat acne problems. This treatment is especially useful in cases of severe acne that do not respond to other treatments. PDT acne treatment also has effects on other skin conditions such as sunburned skin, precancerou