Avoid licking your lips and don't bite the skin on the surface of your lips. The skin will never have a chance to heal if you chew on it. It will end up becoming thicker, giving you black coloured lips. This is a hard habit to break but well worth the effort.
Keep lips covered with a good balm applied several times during the day. Lip balms are now commonly available with an SPF factor. Make sure the lip balm contains SPF 15 or 20. Other ingredients to look out for while buying a lip balm or chap stick are vitamin E and shea butter.
The amla fruit (Indian Gooseberry) is the richest known natural source of vitamin C. Amla provides concentrated nourishment to the deeper layers of the skin. Take it on a regular basis to replenish the skin from within.