1. Apply sunscreen evenly to all skin areas half an hour before going out. Use an adequate amount, and don't forget your lips, eyes, nose, and ears.
2. Generally, for a face and neck area that isn't overly large, applying an amount roughly equivalent to a 3-centimeter squeeze from a toothpaste tube is ideal.
3. For those with oily skin or prone to acne, choose lightweight, non-greasy lotion-based products. Avoid sunscreens in oil or cream-based formulas.
4. Do not mix children's sunscreen products with adult ones. Men should avoid using women's sunscreen.
5. To prevent skin pigmentation, minimize consumption of overly salty or spicy foods.