Hi There are many different causes for dark circles. Inadequate sleep, excessive eye strain, anemia, thyroid dysfunction and recurring allergy are some of the common causes. Please avoid these if possible. Use a good Vit c serum at bed time. Use a hyaluronic acid cream as a moisturiser. Eat healthy and exercise regularly and drink plenty of water. Treatments such as chemical peels and laser give quick fix to the problem. You may also need Prp or filler treatments if indicated.