Always try to moisture your lip with lip balm or any liquid stuff available in the market especially to moisture purpose. Try to avoid dry or mate lipsticks because it dries the surface of your lips and cause the dryness. If you are a working lady and you have to go out daily you can use lip bam or lip gloss.
There is a very useful way to look after you lips. Take some petroleum jelly and apply it on your lips. Take a soft cloth and rub it gently, all the dead skin removes. After that apply again some jelly on your lips to moisture it.
You can apply some milk on your lips when you go for sleeping.
Apply some honey it will also be very effective.
Remember one thing avoids using lotions or foundation on your skin wile applying make up. Lips are the most sensitive part so does not use any experiments on it. Always use quality lip balms or lipsticks because nothing is expensive then your face and you.