Thanks for responding!
We noticed it about 2 days ago.
He is about to shed his head area any day now it looks like we gave him a
bath last night and after he dried off his head is more (smokey).
It has got a bit larger but not too much.
It does not appear to be bothering him at all.
We cleaned the tank last night thinking that might be the case and there were no insects.
The growth is still there and he is currently running around like a mad man.
I just hope it goes away soon.