What should I do about dull skin with acne marks?

Keep the skin clean and exfoliate regularly to promote skin metabolism. Use skincare products containing ingredients such as vitamin C and arbutin, which can help fade acne marks and brighten the complexion. Pay attention to sun protection to prevent UV rays from worsening skin dullness. Ensure adequate sleep and avoid staying up late. Maintain a positive mindset and avoid excessive stress. If the condition is severe or does not improve over time, seek medical advice for professional treatment. Under a doctor's guidance, medications such as vitamin E cream or tretinoin cream may be used to help fade acne scars.