I've never seen raised spots quite like that before. I would worry there's a major infection that is causing absesses. Any chance you've seen them weep any fluid? Or is it just the raised bumps? If a vet could try to drain some of the fluid, they might be able to tell a lot more. Good luck.
And I agree, if I have a BP refuse food a couple FEEDING days in a row(i.e. a couple weeks with trying once per week), then I don't offer for a couple weeks to let him build up some more appetite. If it's not a hatchling, they can afford to miss quite a few meals without any harm at all. If he were a baby, then I'd be more concerned.