poor dd has got some really nasty looking chicken pox blisters in her nappy area, mostly the area between the top of her legs and her groin, but some are right under her labia. I don't want them to get infected obviously, so I've been putting a layer of sudocreme on her when I change nappies. Is this the right thing to do or should I leave them. Will they crust over if they've got sudocreme on them?