Why do we get chapped lips?

Lips are covered by a tissue much like that inside your mouth. It’s a layer that is soft and wet rather than tough and dry like your skin. Sometimes your lips may dry out and even crack open. For me that tends to happen when I get too much sun or on very dry days.

I have learned that when that happens I should use something greasy to smear on my lips and protect them. Most drugstores have stuff to protect lips.