BTW, were or are they housed in a cage with wire flooring? In rats it can cause a condition called bumble foot. Wire flooring is not good to use with any pet.
Yes and no. Yes the cage has wire flooring, however I keep newspaper on top of the wire, and change it daily. The cage they were in before I got them didn't have wire at all.

We are back from the vet and altho it's not good, it's not as bad as it could have been. Her hair was mating around her leg and cutting off circulation. He said it's not too rare in chinchillas, he's seen it before and they usually make a full recovery. I have some medicine to put on it. We go back on tuesday for a check-up. He did say that there is a chance that it may need to be amputated, but he'll do everything he can to prevent that (as will I).

I have faith that Lola's leg will be fine.