Maroon Clown

[ShockSniper]

I was feeding my maroon clown fish this morning and I noticed a small clear bubble like thing on its bottom side. Slightly behind the two lower fins. I've never noticed it before. The fish is acting fine...eating, swimming around, and interacting with all the other fish. Is is something I should worry about? It's too small to take a picture of otherwise I would....it's smaller then his eye by about half.

Thanks

[ShockSniper]

any help with this would be great! So the bubble like thing went away for a day or two and now it came back today but quite a bit larger. Also the maroon did not eat yesterday and still has not eaten today. Seems to be acting fine....swimming around in the anemone, but not quite as active around the rest of the tank. Any ideas?