When I took Accutane, my skin was flaky and starting to crack (think dried riverbed) from being so dry. I couldn't open my mouth too wide because my lips were so dry, they'd rip open and start bleeding (down where they "hinge"). Dried blood in my nose was no fun, either.
I always use Carmex, it's my favorite. I'll have to ask my sister what this other stuff she uses is called.