Thank you for your reply!
We feed him everyday and he can eat around 7-10 dubia roaches or super worm per day. And all the insects are coated with calcium powder with vitamin D. He drinks every 3 days.
The light bulbs are changed every 4 months and we just changed the light bulbs about 2...
I took him to a vet before, and he says it's just fat and I should not worry about it ($400), but it's getting bigger and I'm worried. Anyone have any idea what this is? Should I go see another vet?
Info:
age: ~1.5 years old
food: super worms + crickets with vitamin D powder
lights: 5.0 uvb...