Dry lips are only common in dry season here, that's when you have your lips cracking like the floor of a desert, you can't fight it, the season wins the body flesh formation at this point.
I can remember when it's dry season, my mum has this thing for cracking flesh especially around the leg region, you just can't look at her, she is ugly at the leg region starting from the knee down.
She always try using so many cream to cover it up, the only one potent enough to cure the curse, so to say, is Shea butter, when its rub in abundance it has a way of covering up the fault lines on her leg.
Am not a carrier of her "curse", though I share a little bit of it. I've researched and goggled it out too, I found out its caused by lack of some vitamins.