What should I do if my skin is very yellow and dull during my teenage years?

For teenagers with yellowish and dull skin, the following are recommended: 1. Ensure adequate sleep and a balanced diet, with increased intake of foods rich in vitamin C. 2. Avoid prolonged sun exposure and use appropriate sunscreen products. 3. Maintain skin cleanliness by using gentle facial cleansers. 4. If symptoms persist, seek medical advice to rule out potential underlying conditions. Skin health requires long-term care, and early intervention can help improve skin condition.