Abstract
Introduction: Ultraviolet (UV) is one of the important environmental factor affecting skin aging. Therefore, there are many people who are reluctant to expose themselves to ultraviolet rays. On weekdays, workers are exposed to UV rays for less than an hour, but on weekends, they are exposed to UV rays for more than two hours due to outdoor activities, according to a survey. Therefore, the purpose of this study is to study skin changes when skin without UV exposure followed to strong UV light and skin with suberythemal doses of UV followed to strong UV light.
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