What are the causes and treatments for my frequent chapped lips.?

See See derm: See dermatologist for evaluation. You probably have allergy to lip balm or true eczema. Usually Hydrocortisone will control this.

Dryness - moisture: Causes - dry, sun or solar damage. Hydrate well- water is best. You can apply lip balms with beeswax base or oil base creams. Remember that lips require solar protection just like your skin – apply & reapply balms or creams with a minimum spf of 15. Going skiing ?- protect from sun & windburn by covering with a scarf or a ski / snowboard face mask with visor. Dry air? - use a humidifier.