What should I do about dull, yellowish skin with dark spots?

It is recommended to first address skin dullness and hyperpigmentation by improving daily habits, such as ensuring adequate sleep and avoiding prolonged sun exposure. In terms of diet, increase intake of foods rich in vitamins C and E, which help inhibit melanin formation. Use skincare products containing ingredients like retinoic acid and arbutin to assist in fading dark spots. If symptoms are severe, seek medical advice promptly and consider laser therapy or chemical peels under a doctor's guidance.