Btw here are the vet's online comments, I'm sure you'd be interested:
>> Subject: Re: Treatment for Bullfrog with photos
>
> I agree this is likely cage husbandry problem, but be aware of the following
>
> 1. This frog appears also to have reddish tinge to the ventral skin.
> If this is real and not caused by photography artefact, this might
> mean that there is sepsios, not just local infection ad prognosis is
> poorer.
>
> 2. Baytril injection is very alkaline and has alcohol in it and can be
> damaging to frog skin. Consider using oral solutrion with some
> glycerin added instead.
>
> 3. There are some real zoonotic pathogens in amphibians, includig
> mycobacteria (M marinarum, M smegmatis, M cheloneae, others) and
> salmonella. Cytology at least would be a good idea.
>
> 4. Human skin has persistent organic acids that can irritate amphibian
> skin. Wash hands in distilled water or the frog's swimming water
> before handling.