You need to get him to a vet immediately then. Not having a scale and judging weight by eye is not accurate. Unfortunately when we judge by eye we don't notice until they are 1. Emaciated or 2. On deaths door and or both. That's the nature of the beast. They don't show their weaknesses so they don't get eaten. So when they are losing weight you really can't see it. A digital scale costs a meager 10$. You probably would have noticed this months ago before it was a noticeable issue and things would have been a ton easier. A weekly or biweekly weight check does wonders. If you even have one reptile you need a scale. If you happen to have more than 1 it's a necessity. Make an appt for a vet to do a fecal test. They aren't costly and the dewormer isn't costly either. At this point if he is eating and is still losing weight I can assure you that there is some illness at play that needs to be taken care of. The behavior you were speaking of mites would cause but mites wouldn't cause the weight loss to my knowledge. As I said before though a tapeworm or pinworms are two of the most common parasites with reptiles and they do cause eating animals to lose weight. I keep a log on every single herp I have in my house. Especially the balls. Because they are notorious picky eaters a scale is the difference between wondering and knowing.
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