Depending on the type, light could either hurt or help the skin over time. Sunlight, for example, comes with ultraviolet (UV) radiation that can damage skin cells and affect the production of fundamental building blocks such as collagen, elastin, and hyaluronic acid. But a newer type of light-based therapy can be used to treat a variety of both medical and cosmetic skin concerns: blue light or photodynamic therapy. Boise, ID , dermatologist Dr. Naomi Brooks  highlights what it can be used for and how it works. 

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