WTF with oddly colored spots?

[aradia]

Hi all! I have a blue phase WTF, just a baby, and I've had him for about four months now.

I recently left him in the care of my roommate for about four days while I was housesitting, before which I didn't notice anything unusual, and I got home today and noticed that he looked sort of bony and had some weird yellowish spots on him. I just fed him and he ate three small crickets, he's moving around pretty normally, and the only strange thing I've seen him do is "yawn" a bit after eating the crickets.
I'm mostly concerned about the spots. They don't look like anything I've seen before.
I've attached a picture - I usually take my frogs out to feed them when I get concerned about their eating habits, so that I can sort of regulate. The spots I'm talking about are the ones by his head and ears, obviously not the regular white ones.