First thought that came to my mind was gout as well, but hard to be certain without seeing it. Lizards gain little to no hydration through soaking. They gain most of their hydration through drinking, the greens they eat, and having a humid burrow, this allows them to breathe in moisture. Gout develops over a long period of time and symptoms can be sunken eyes and swollen joints. There is a strong association between gout and liver failure so there is a link there.
If you are up for some reading: http://www.savannahmonitor.net/ Click on the "click here tab" under the first paragraph of "Temperatures and Humidity", while this is in relation to a Sav, it does explain gout incredibly well and the care overall should be applied to all lizards not just monitors.
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