I've only had one survive this kind of problem. It's chances arent good, it has to be left to dry and fall off on it's own. I have tried cutting them off before and keeping the damp hoping they would absorb it, those ones died. maybe try sticking it to it's underbelly so the other chicks and momma wont pick at it.
that's the only thing that I've had work so far.
Only thing to really do is to wait and see if it dries up and falls off. It looks like it's just yolk - I don't see any intestines or anything like that, so that's good.
