Could be alot of things actually (including the spleen). Fatty degenerative liver disease is kinda rare actually, don't see it too often in geckos (or any animal for that matter).



Is the spot more like a dot on the surface of the skin, or sort of a dark mass underneath the skin?



I know it's costly, but I'd get your leos checked out for crypto (since your previous leos died and had the same symptoms). Crypto spores hang around for a while (sometimes years), and if you didn't do a massive disinfecting using bleach or ammonia, baking/boiling the hides and dishes, etc, the spores could've found their way to your new geckos.



I'm not saying it's definately crypto (since it would mean there's no saving your geckos), but it's a possibility since its symptoms also include dark spots on the belly.



Also make sure what your seeing is not a vein. Maybe a post a pic (pics worth a thousand words).



-Lemur 6

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