What should I do about yellowish and dull skin?

1. Adjust lifestyle habits: Ensure adequate sleep and avoid staying up late, which helps improve skin tone. Maintain a healthy diet by moderately consuming foods rich in protein, vitamins, and trace elements to provide sufficient nutrition for the skin. 2. Enhance skincare: Perform regular deep cleansing and moisturizing routines to maintain the skin's water-oil balance. Pay attention to sun protection by avoiding direct UV exposure to prevent hyperpigmentation. 3. Actively treat underlying medical conditions: If suffering from underlying diseases such as endocrine disorders, liver disease, or kidney disease, seek timely treatment to improve skin condition.