Try epsom salts and a thin layer of flamazine (silver sulfadiazine) cream afterwards, which is also available in the USA.We've treated this with soaking in Epsom salts and after drying applied a very light dab of Sudocreme which is a nappy cream you buy over here. But we've never had to do this for long periods of time - some members have reported that regular use of this cream can thin the skin and make the problem worse. I'm also wondering if you're just going to be stuck between a rock and a hard place and that the regular soaking to keep her bits clean has softened her feet a little
One of my older girls carried a persistent bumble towards the end which didn't heal but had spates of being better and then worse. It was connected to her having arthritis which wasn't being treated at that time as she seemed to move around OK and I was just assuming all older piggies were a bit stiff. Thinking of you and Margaret x
Regular soaking or overuse of any foot cream can unfortunately mean that bugs can get into the skin. Older/frailer piggies standing in their excrement are particularly prone.
See chapter 4 of our mobility issues care piggies guide (the recommendations are from an experienced exotics nurse specialising in guinea pigs): Looking After Guinea Pigs With Limited or No Mobility