It's not uncommon for them to sometimes have little patches or spots of non-colored scales pop up after a shed. I've heard it described as something similar to us having a patch of dry skin...not the same thing, but a similar in the fact that it can pop up anywhere and it is temporary and harmless. It should clear up after the next shed, and you may or may not see a new spot next time.
That's good to know! I would have freaked out if that had happened to me.