I've lurked on this site for quite a while but this will be my first post. Anyways, this isn't anything urgent but it's just something that has confused me for a while now.
My one betta (not my avatar) seemed to develop a small bump right on top of his head, he still acts fine and healthy though and it's not any weird color. I've searched the internet and haven't been able to find anything about this kind of bump, and what's even more strange is that my first betta that I had before him also developed this bump and later died of what I think was dropsy. I doubt that they were connected though.
I was just wondering if anyone on here has any idea what this could be because I have no idea.