He used the liquid nitrogen on a number of places on Bob's arms, head and face. This is to freeze any pre-cancerous keratoses before they go bad. Magie has had a bunch of these done over the last several decades. It's no big deal. It makes a little blister that is really, really annoying for about a week.
He has sent a prescription to Medco for a cream for Bob to put on his face for the Rosacea (non-specific, rosy-red rash) plus some stuff to use to wash his face. After a couple of months (according to the brochure we picked up) the redness should be receding from Bob's face. He does not think Bob will get any reactions from these new items like he did from the other stuff.