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Core Points - Sunscreen is essential for both beauty and skin barrier protection, with a focus on preventing damage from UVB and UVA rays [3] - Different types of sunscreen include physical and chemical options, each with distinct properties and suitability for various skin types [3] - SPF and PA ratings are critical indicators of sunscreen effectiveness against UVB and UVA rays, respectively [4] Group 1: Sunscreen Types and Mechanisms - Physical sunscreen includes inorganic agents like titanium dioxide and zinc oxide, which reflect UV rays and are suitable for sensitive skin [3] - Chemical sunscreen uses organic compounds that absorb UV rays, offering a lighter texture but may have stability and sensitivity issues [3] Group 2: Choosing Sunscreen Based on Activity - For outdoor activities, protective clothing and accessories are recommended, while specific SPF and PA ratings should be chosen based on exposure levels [4] - In high UV environments like beaches or mountains, higher SPF and PA ratings are advised, with waterproof options for activities involving sweat or water [4] Group 3: Special Considerations for Different Populations - Infants under 6 months should avoid sunscreen, relying on clothing and shade for protection, while older infants can use low-SPF physical sunscreens [5] - Elderly individuals and pregnant women have specific sunscreen needs, focusing on physical options and simple formulations to prevent skin issues [5] Group 4: Remedies for Sunburn - Immediate treatment for sunburn includes cold compresses and specific solutions available at pharmacies, with medical attention required for severe symptoms [5]