Okay So My Lips Are Rarely Ever Dry As I

Okay so my lips are rarely ever dry as I use lip balm regularly especially during the winter as I live in a very cold environment, the other day I woke up and my lips hurt awfully, sort of like they were burning and only putting lip balm on seems to calm it down but not by much. I haven't introduced any new lip products or anything like it to them recently except for sharing a lipstick with a friend a day before they started burning