The only way is to keep them moisturized. Also you could increase your water intake. Do you have a dry mouth too. Also you may be having
vitamin deficiency, did you get that tested. Vit A, B2 and B6. Get multivitamins to see if it improves. Try and use a mild lip scrub before using lip balm. A good treatment would be microdermabrasion too.
Next Steps
Visit a dental cosmetic clinic. Microdermabrasion and mild chemical peeli ng could help. We could cater to your needs at 'Imprssns n Exprssns' Blore.
Health Tips
Do always use a lip balm and increase water intake