Bearded Dragon head is turning white

Question
Hello,

I have a male bearded dragon whose head is starting to turn white. He seems to be acting and eating okay. Should I be concerned?  

Answer
I don't think so, BUT lizards are not my forte.  Try this question with one of the experts whose specialty is lizards.  Are there other dragons in w/ him?  If you had said it as turning black, then I'd say dominance or breeding display. White???  Maybe he's getting ready to shed...