Detailed answer

To prevent dark spots from appearing, it is essential to protect your skin from harmful sun exposure. Apply a broad-spectrum sunscreen with a minimum SPF of 30 every day, and reapply it every two hours if you're exposed to the sun for an extended period. Additionally, seek shade, wear protective clothing, and use a wide-brimmed hat for added sun protection. Incorporate skincare products that contain ingredients like vitamin C, niacinamide, kojic acid, or hydroquinone. These ingredients help to lighten existing dark spots and prevent the formation of new ones. Consistency is key, so apply these products daily, and be patient as it can take several weeks to see results.