Anyone who's said it doesn't hurt to smile must not have had chapped lips.

Chapped lips are basically an infl ammation of the lip itself and can occur for a variety of reasons, including exposure to wind, dry air, cold temperatures and the sun, said Stephanie Burleson, family medical physician with Utica Park Clinic Jenks.

“Chapped lips can be a big problem when they get sore. They can interfere with eating, drinking, talking or other types of everyday things," she said.

Breathing problems such as asthma that cause people to breath out of their mouth more than their nose can also trigger chapped lips, as can some medications.

“Medications for acne, like Accutane, are notorious for drying lips," Burleson said.

Heaters also affect the lips by causing the air to dry out.

Acne And Rosacea Getting You Down? Laser, Light And Cosmetic Treatments Give Patients A Much-Needed Boost

It is estimated that approximately 50 million people in the United States alone are affected by acne vulgaris, and another 14 million Americans experience the redness, flushing and pronounced blood vessels associated with rosacea. While there are no cures for these persistent skin conditions, dermatologists are broadening their treatment options to include laser, light and cosmetic therapies that are proving effective in managing these conditions and improving patient satisfaction.

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Mike Luckovich

Senator Clinton has argued, I think fairly, that she has the experience to start on Day One. I think that it's important to be right on Day One."