Abstract
In photodermatology, UV radiation is the component of the solar system that has attracted the most interest as it represents the greatest risk of skin damage from solar exposure. Efficient protection strategies have therefore been developed to protect skin against powerful solar radiation. Recently, there has been increasing evidence to suggest that less energetic radiation, such as visible light and infrared radiation, might also influence skin physiology. Yet, it remains unclear, regarding risk assessment, whether visible light irradiation induces positive or negative effects in skin and when appropriate protection is needed. This review focuses primarily on blue light as part of the visible spectrum and sets out current mechanistic understanding of the benefits and risks of blue-light exposure to skin. Furthermore, it discusses phototherapies and potential strategies for protecting against detrimental effects of blue light such as hyperpigmentation and premature skin aging.
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