There are different stages of bumblefoot from a red raised sore that you just watch (more like a pressure sore), to a raised fleshy lump, to a nasty infected, bleeding lump that often has a hole in it.
The first one is watch and wait
The 2nd can easily be "treated" at home with Blu-kote (a large animal antiseptic, more info below)
and the 3rd needs antibiotics so you can get rid of the infection before going back to the Blu-kote.
I have only dealt with one infected bumblefoot case and this was prior to my keeping all my medical pics on photobucket, so I don't have anything for you.
This is moderate bumblefoot (not too big, no infection) prior to treatment
This is quite a few days later, the Blu-kote is shrinking it
Now Blu-kote is awesome stuff for this BUT it stains like crazy, any fabric is ruined if it gets touched. I would get the dauber bottle of Blu-kote (bought at tack stores, feed stores. online?, etc), and put it in a plastic zip-loc bag with a Q-tip. A large stainable towel would go on my lap with the rat. I would open the bottle, dip the end of the Q-tip in and daub the bumble carefully , then pat it with the edge of the towel until it didn't transfer the stain anymore. Done. Rats don't like to be put on their back for this so be quick and don't use too much LOL. If you get it on your skin, you can scrub it 9and the skin layers) off :laugh4:
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