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for the skin usually involve exposure to ultraviolet light. The exposures can be to a small area of the skin or over the whole body surface, as in a tanning bed. The most common treatment is with narrowband UVB, which has a wavelength of approximately 311-313 nanometers. Full body phototherapy can be delivered at a doctor's office or at home using a large high-power UVB booth. Tanning beds, however, generate mostly UVA light, and

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