防晒口罩“越戴脸越黑”？

Core Viewpoint - The article addresses concerns regarding the effectiveness and safety of sunscreen masks, clarifying misconceptions about their impact on skin pigmentation and temperature regulation. Group 1: Mechanism of Sunscreen Masks - Quality sunscreen masks block UV rays through two methods: increasing fabric density or thickness to reduce UV penetration, and using fibers that absorb or reflect UV rays [2] - High-quality fabrics often undergo special weaving or treatment processes to enhance UV protection, requiring specific dyes to achieve a high UV protection factor (UPF) [2][3] - According to national standards, products with UPF greater than 40 and UVA transmission rates below 5% are classified as "UV protective products" [2] Group 2: Temperature and Skin Pigmentation - Wearing sunscreen masks can raise local skin temperature, but this increase is negligible compared to the temperature rise caused by direct sun exposure [3][4] - There is no evidence that a temperature of 42 degrees Celsius directly activates melanocytes; factors like UV exposure and hormonal levels primarily influence melanocyte activity [4] - Some users may experience skin darkening due to low UPF masks or improper maintenance, leading to UV penetration and skin irritation [4] Group 3: Recommendations for Consumers - Consumers should prioritize masks with a UPF greater than 40, with UPF above 50 being ideal, and ensure the mask covers the necessary facial areas effectively [6] - Regular replacement of sunscreen masks is essential as their protective effects diminish over time and with washing [6] - It is advised to clean masks regularly to prevent oil and dirt buildup, and to apply sunscreen on uncovered areas of the face [6]