Red fleshy protrusion from giant danio

[ticojpunk]

One of my Giant Danios has a red fleshy looking protrusion from what looks like it's anus. Any idea what this is? It's swimming around completely normal with the other danios. It looks to me like maybe it hurt itself somehow. Not sure what to think. Any ideas?
Here's another photo...

 

[CindiL]

It might be anal prolapse, I don’t think there is any treatment for it. I don’t know a lot about it, maybe someone else does. Sometimes they get smaller and go away on their own.

Is it moving at all? I am wondering about worms also.

 

[ticojpunk]

Does seem like it was a rectal prolapse. And I say WAS because it did correct itself, and that danio is doing just fine now. I just really limited their feeding for a few days. It persisted for a few days then on day 4 or 5, I forget, it had corrected itself by morning. All is well. Thanks for the input everyone.