Our lips are not protected by the thick layers (called cornified tissue) of skin like on the rest of our body. They have much fewer layers of skin. This causes the blood vessels in our lips to be closer to the surface. It is this closeness of these blood vessels that gives our lips that beautiful rosy red color. Because of this lack of skin, they are much more prone to drying out, along with other various problems such as burning from the sun and wind.
Another problem that contributes to dry lips is, they have no oil glands, which obviously makes it more difficult for them to stay moist. And that's not all, the reason they dry so easily is because they have less pigment in them compared to the skin on the rest of the body. Therefore they burn more easily from the sun.
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