I apologize that no one has responded to your question sooner. Different experts come online at various times. I just logged on and saw your question. My name is ***** ***** I’m a biologist with a special interest in reptiles. I'm sorry to hear of this problem. If you still need help, some additional information will be useful.
What brand of UVB light do you have? How old is the bulb?
How is your dragon's appetite?
What temperatures are you now maintaining under the basking light and on the cool side of the cage?
How long has he been ill?
Is he 10 months or 10 years old?