As anyone who's suffered a hangover knows, alcohol doesn't do your body any favors. It's particularly rough on your complexion. Heavy drinking causes dehydration, which can lead to dullness, wrinkles and dry skin. It's also may trigger flare-ups of skin conditions such as acne, rosacea, eczema and psoriasis. In some people, alcohol dilates the tiny blood vessels near the skin's surface, creating a flushed appearance. And it robs the body of vitamin A, which helps the skin renew and repair itself [source: Magee] through the production of collagen. According to the U.S. Department of Agriculture, women should drink no more than one alcoholic beverage per day, while men can consume up to two drinks [source: U.S. Department of Agriculture].