Lips Become Chapped Due to the Following:

• Exposure to wind, sun, and cold, dry air
• Obstructed breathing, such as allergic rhinitis, which forces you to breathe through your mouth
• Contact dermatitis due to irritants or allergens in cosmetics or skin-care products
• Certain medications, such as those used to treat acne
• A habit of licking your lips
• Dehydration

To Prevent Chapped Lips Try These Tips:

• Use an oil-based lubricating cream, such as Aquaphor Healing Ointment, or lip balm containing petrolatum or beeswax.
• Apply lip balm before going in cold, dry weather. Reapply several times while outside.
• Avoid licking your lips. Saliva evaporates quickly, leaving lips drier than before you licked them.
• Avoid using a flavored lip balm, which can tempt you to lick your lips.
• Stay hydrated by drinking plenty of fluids.
• Use a humidifier at home to keep moisture in the air.
• If chapped lips become more severe, consult your doctor.

Source: “Chapped lips: What is the best remedy?”, Mayo Clinic