Help! I found something weird on my fish

Today I noticed that each of my 3 Zebra Danio's have a white bump on their tail fin. I looked up fish diseases, but none of them seem to describe what I see. Ich is described as multiple small white spots the size of a grain of salt. They each only have one bump that is a bit larger than a grain of salt.
Does anyone know what this is? Is it something I should be worried about?

 

Can you post a picture?

-Chelle

 

I'm unable to get a picture of them. They don't stay still long enough!!! :x

Also, it doesn't match any of the fungus descriptions either. It doesn't look "cottony" as they describe.

 

About how big is it?

Here's a couple ich spots on a 1" glowlite


-Chelle

 

It looks similar to that, but they aren't as round and maybe a tiny bit larger. Maybe I should treat them for Ich just to be on the safe side?

 

Yeah, it wouldn't hurt to go ahead and treat.

-Chelle