Arte, do you think he will put some cream on it to help with that? It sounds like he's developed lick eczema - heaps of kids get it around their mouths from licking their lips and from dribble etc, but if he's constantly licking the same spot on his hands, it's only natural he will get it there too. Maybe laying down some ground rules will help with where he does it? Or even get him some gloves to wear in public at least?