What should I do about yellowish or dark skin?

1. Focus on sun protection, balanced diet, and regular作息 (daily routine). 2. If there is no significant improvement, consider visiting a dermatologist for a professional diagnosis to rule out potential underlying medical conditions. 3. Choose suitable whitening products according to your skin type, but always pay attention to product ingredients to avoid allergic reactions. 4. Pay attention to sun protection: apply sunscreen before going outdoors, and select sunscreen products suitable for your skin type and needs. 5. It is recommended to increase intake of foods rich in vitamin C, such as citrus fruits, strawberries, and kiwi, which help inhibit melanin production and brighten skin tone.