Core Viewpoint - The article emphasizes the importance of sun protection due to the high ultraviolet (UV) index across many regions, highlighting the risks of sunburn and sun-induced skin conditions like solar dermatitis [1][2]. Group 1: Understanding Solar Dermatitis - Solar dermatitis is described as a "war" between skin and sunlight, leading to inflammation, redness, pain, and potentially blisters and peeling when exposed to strong UV rays [3]. - There are two main types of solar dermatitis: sunburn, which is a phototoxic reaction affecting anyone exposed to excessive sunlight, and polymorphic light eruption, an allergic reaction more common in sensitive individuals [4]. Group 2: Common Triggers of Solar Dermatitis - The primary triggers for solar dermatitis include excessive UV exposure, with UVA penetrating deep into the skin and UVB being more intense in summer [5]. - Contact with photosensitive substances such as certain foods, medications, and cosmetic ingredients can also provoke reactions [6]. - Individuals with weakened skin barriers, such as those with sensitive skin or eczema, are at higher risk [7]. - Genetic factors may predispose some individuals to heightened sensitivity to UV radiation [8]. Group 3: Prevention Strategies - Effective prevention of solar dermatitis involves proper skin protection, especially for those with a history of the condition, including using umbrellas, wide-brimmed hats, sunglasses, long clothing, and sunscreen [9]. - It is advisable to avoid outdoor activities during peak UV hours from 10:00 AM to 2:00 PM [10]. - Limiting sun exposure to no more than two hours while taking protective measures is recommended [11]. - After swimming, it is important to wash the body with warm water and gentle cleansers [12]. Group 4: Response to Symptoms - For mild symptoms, cold compresses can alleviate discomfort, and it is crucial to avoid further sun exposure [14]. - Small blisters may resolve on their own, while larger ones should be treated by healthcare professionals [14]. - In cases of severe symptoms like headaches or nausea, immediate medical attention is necessary for allergy treatment [15].

Group 1 - The article highlights the upcoming peak of extreme high temperatures in China, affecting a large area from southern North China to central and northern South China, with many regions experiencing rare high temperatures for this time of year [1] - Experts recommend avoiding outdoor activities between 10 AM and 4 PM when UV radiation is strongest, and suggest carrying sun protection gear such as umbrellas, sunglasses, and sunscreen [1] Group 2 - According to Dr. Yang Shuxia, the director of the Dermatology Department at Peking University First Hospital, darker clothing provides better sun protection due to its higher dye concentration, which absorbs more UV rays [2] - The article emphasizes that even on cloudy days, about 70% of UV rays can penetrate clouds, making it essential to apply sunscreen regardless of weather conditions [3][4] Group 3 - For prolonged outdoor activities, experts recommend a combination of physical and chemical sun protection, including UPF 50+ clothing, wide-brimmed hats, and SPF 30+ sunscreen, applied 20 minutes before going outside and reapplied every two hours [5][6] - In case of sunburn, immediate cooling with lukewarm water and the application of aloe vera or vitamin E products are advised, with a recommendation to seek medical attention for severe cases [7]