we got given a vat of aqueous cream. i used to cake martin in it. it seemed to help a lot. he never got dry skin, he instead had moist burnt (somewhat smelly) skin. But when the skin fell off there was new pink skin underneath. he was also prescribed this gel type cream which was to act like a second skin (probably the same thing charm said), but he never needed it.
Oh we also had this very fine cottony gauze type scarf that wa disposable, and that we used to cover the skin and stop the clothes from rubbing.
I hope You find something to sooth Andy's skin.