1. Even indoors or on cloudy days, ultraviolet rays can still penetrate clouds or window glass, causing potential harm to the skin.
2. Sunscreen products not only prevent sunburn, but also help prevent skin aging, pigmentation, and other issues caused by ultraviolet radiation.
3. When not exposed to the sun, especially when expected to be exposed to natural light (such as working by a window, engaging in brief outdoor activities, etc.), an appropriate amount of sunscreen should also be applied to protect skin health.