Zebra finch with an injured toe?

I noticed today that one of my two male zebra finches appears to have an injured foot. His rear left toe is curled up under his foot so that he steps on it when he perches, and as the day has gone on it has darkened. He and his cage mate seem perfectly happy, and he has been active and vocal as usual all day, except for favoring the injured foot. I have read online that zebra finches will sometimes suffer injuries to their feet and lose toes as a result, without much impact on their later lives. Will this likely be the case with this bird? I was also wondering if infection was something I need to worry about, and, if so, what steps I can take to avoid it. If necessary, I could take him to a vet, since we have an avian vet very near my house, but I am dubious of their ability to help an bird this small. Also, since he is the omega bird in the cage, might the other male bird pick on him if he loses a toe? They usually get along quite well aside from a few spats every now and then, but I'm worried this might affect the dynamic in the cage. Any advice on this situation would be much appreciated.