When you have chapped lips, try exfoliating with a lip scrub then applying a moisturizing lip balm on top. Next apply a layer of Vaseline. The Vaseline step is even more important when going to bed.
Exfoliating will help eliminate the chapped skin, moisturizing balm will help to moisturize and heal, and the Vaseline will seal in the moisture which ultimately will help it heal faster. This is what I do whenever my lips get chapped.