Hello, bumblefoot is a staph infection, so be sure you wash your hands really well after dealing with it.
I have treated it two different ways:
The one hen I had with it, hers kept getting infected. Per the vet, I soaked her foot in epsom salts for 15 mins. everyday. Got the plug (scab) out and applied neosporin and bandaged...for 2 years. She died when the vet did surgery on her to remove the infection surgically. She was also on oral antibiotics. She died with bumblefoot.
The other hen still has a small scab on her foot, it does not get infected and I just leave her alone and keep my eye out for infection. So far it has been about 2 years now and she does not have problems with it.
So that said, it all depends on whether or not there is infection, are they bothered by it.
If I had another one that had issues (infection, limping, swelling) I guess I would go the soaking, neosporin, removing the plug route again. I would not elect to take it to the vet for surgery.
This is my experience with bumblefoot. Good luck with yours.
Check this out:
http://www.avianweb.com/bumblefoot.html