According to the Old Farmer's Almanac:
Cranberries contain malic acid, a natural astringent. Cut open a cranberry and rub it over your chapped lips. This will help strip away dead skin cells while at the same time infusing your lips with protective antioxidants.
I've got whole cranberries in the freezer right now. I'm going to thaw some and give it a try. My lips aren't chapped but I'd like to see how it feels. Anyone else game enough to try it?