Cracked lips happen when your lips are excessively dry, peeled or chapped. They are easy to spot and on some occasions cause bleeding. In most cases, cracked lips are not a case for concern and usually very mild. The main causes of dry lips are dehydration, sunburn, weather, licking your lips, bad diet and a lack of nutrition.
The best remedy is to apply lip balm or use a sunscreen when going outside for long periods of time. It is also recommended to drink plenty of water to negate the effect. Personally I use vaseline. It definitely does its job especially when applied before I sleep or go to work.
Check out the video below for another way to get rid of those chapped lips: