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In page Light therapy:

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According to the American Cancer Society, there is some evidence that ultraviolet light therapy may be effective in helping treat certain kinds of skin cancer, and ultraviolet blood irradiation therapy is established for this application. However, alternative uses of light for cancer treatment – light box therapy and colored light therapy – are not supported by evidence.[1] Photodynamic therapy (often with red light) is used to treat certain superficial non-melanoma skin cancers.[2] Mycosis fungoides can be treated with narrowband UVB light.