I have two healthy wild caught frogs and an unhealthy one. This is the unhealthy one, he lives alone in his own enclosure. He is usually skinny. He's been rather lazy lately and upon inspection I discovered something on his tummy that I haven't seen before. It looks like a ring. The spots weren't there before either. The ring feels solid and when I touched the area his skin moved around but the ring stayed in place. We're going to the vet next week.

Please take a look at his before and after pictures and if you have any ideas let me know.

(Note: The before picture isn't very good, but I happened to have it, so I included it.)

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If I were to guess, I'd say bloat?