"Some individuals are extremely sensitive to alcohol and the histamine release [or inflamation] that it can cause," says Engelman. Alcohol can widen the blood vessels, which causes dark circles to look more prominent.
To cut down on the dehydration from alcohol, grab a reusable water bottle to keep it with you all day. Swell bottles, pictured above, keep liquids cold for 24 hours. And because of their exterior material, the bottle won't get wet on the outside (which can ruin all of the other things you're carrying in your purse).