Finally got a response from the breeder. Can't say that it was really much help.

First he stated that it was normal and it comes and goes. However, he also stated that he has no idea what causes it, but is not a health issue.

Then said that maybe it was about to go into shed or dehydrated.

Now I can 100% cross those last two out. Like I said, not much help, though I do appreciate his response.