Abstract
Phototherapy of acne has moved, due to the long term adverse effects of UV light, the young age of patients and due to the relative low efficiacy on acne, outside the ultraviolet band and outside the medical dermatology, e.g. to the esthetic and cosmetic dermatology. There are lasers, blue and red light and photodynamic therapy available.
Their theoretical mechanism of action and the benefit/risk/cost ratio limit their meaningful indication to mild or moderate acne.