My uncle has had it badly all his life- he gets it on his elbows and knees...  He now takes 'Transfer Factor'', by 'For Life', and it has almost cleared it up.  Im not selling the stuff btw- Im just amazed how well it worked.  Takes time, and its not something you rub on- but imagine not having to?!!  Just a thought anyways. PM me if you want me to find out from him some details... 
