Detailed answer

To prevent hyperpigmentation during outdoor marathons or races, it is crucial to protect your skin from the sun's harmful rays. Apply a broad-spectrum sunscreen with a high Sun Protection Factor (SPF), ideally SPF 30 or above, to all exposed areas of your skin. Reapply every two hours, or more frequently if sweating excessively. Additionally, consider wearing protective clothing, such as wide-brimmed hats, long sleeves, and sunglasses to shield your skin from direct sunlight. Seek shade whenever possible, especially during peak hours when the sun's UV rays are strongest. By taking these precautions, you can minimize your risk of developing hyperpigmentation and promote overall skin health.