The primary risk of not using sunscreen is exposure to harmful UV rays, which can lead to skin damage, premature aging, and an increased risk of skin cancer. Sensitive skin types may benefit from mineral sunscreens, which are less likely to cause irritation compared to chemical alternatives. Additionally, the environmental impact of sunscreen ingredients is a growing concern, with mineral sunscreens being a safer choice for marine ecosystems. Failure to apply sunscreen during peak UV hours or after water exposure can significantly reduce its effectiveness, leaving individuals vulnerable to sunburn and long-term skin damage.