Well, my lips looked like a disaster for years and everyone stared. I didnt care. I worked in a school too and the kids and parents always probably wondered what was happening. Funny thing is that the kids all had the same problems as us in the winter. It was as if they all had EC. So I wasnt bothered.
Dont know what caused mine but Id guess over use of chapstick and stress, and picking at them. The breathing techniques I just push all the pressure through my lips when lifting the weights. I direct it all there rather then to the muscles while concentrating at the same time breathing heavily and pushing out through the mouth.