Every year I have a split in the skin (you can actually see the split with the two thicker sides) of my right nostril. I use to assume it was from dry air in the winter but here it is towards the end of April and even the Neosporine won t heal it. I do not have allergies and I happen to be a mouth breather (don t know why as if I concentrate I can breath through my nose). My question is, what actually causes the split? Should I be using saline to provide moisture? Thanks!