i took on an elderly piggy with bumblefoot & i think hers were caused by possible heart issues & previously not the best hygiene standards for her hutch, but i used Gorgeous guineas foot lotion/ balm- i cant remember the exact name for it but if you telephone them, they will advise you of the correct one to use.
i soaked her foot for about 10mins in (boiled but cooled to) tepid water with about half a teaspoon of epsom salts dissolved into it, i then poured it into a clean lid like a marmite lid (wide but shallow).
The idea was taken from an old peter gurney book i think.... not sure it may have been "piggy potions" by him.
keeinig her occupied with favourite foodstuff in front of her, gently supporting securing her foot in place (with a free but soggy hand) massaging her foot pad when possible in the solution.
i then dried her feet with a clean lint free towel, usually patting dry with kitchen towel & then massaged the gorgeous guineas foot balm in.
it was 2 or 3 times a day i would do this, all according as to time restraints & the pus filled hole seemed to reduce in size &contents when the scab soaked off.
you do however have to make sure the feet are scrupulously cleaning with an open wound &bathe regularly.
After 10/14 days her feet were clearing up nicely (she was kept on shredded paper bedding in her hutch outside-although other soft clean beddings such as fleece,vetbed or towels etc can be used). unfortunately due to her age &other health issues (probably connected with her heart, although its only because f this forum i'm now aware of this) she passed away.
Aww your pigs are gorgeous



... Boys are often more weighty than the girls with guinea pigs anyway, but my Grace is tipping the scales normally at about 1400g (my Big Honker baby)& Ellie is about 1200g so its all a bit of a personal thing per piggy, the same as us humans.... some of us are chunky(me).... some of us are not- just luck of the draw on genetics generally i think, Small portions of nuggets, variety of daily veg & copious amounts of hay are also the way to go
Is darwin the piggy at the bottom? might be worth trimming his nails back a little if this is a recent photo? Nails that are quite long can cause piggies to walk a bit awkwardly which doesn't help bumblefoot either.
Its a good job i have to girls or the pignapping jacket would be coming out!
xx