getting extra sleep may make your dark circles worse if you are allergic to dust mite droppings ... getting fancy miracle creams may make it worse, if you are allergic to any of the hundreds substances used in them, getting cucumbers carrots and whatever else people suggest may make your dark circles worse - if you are allergic to certain foods ...

first line treatment is getting skin AND blood allergy tests (skin tests do not detect delayed reaction allergies) and then you can create your treatment plan, all other options are merely based on luck, i found useful tips at http://www.whydarkcirles.com and Allergy Advice

Here is a link that might be useful: Dark Circles under the eyes