Betta Lump

Hi, my grandma has a 2.5 gallon aquarium with a single male Betta in it. Its been doing very well for about 6 months now. Apparently 3 weeks ago she noticed a silvery lump on its left shoulder area. It hasn't gone away and apparently it's gotten a little bit larger. She cleans the tank every week and I checked the parameters and everything checked out as normal. Can anyone tell me what this lump is? I'll try to post a picture later on here.

It's shaped like a silvery ball protruding from the scales. And that's what we were wondering too. She siphons the gravel and does a 25% water change every week and cleans the filter once a month.

Here's a picture of the Betta and the lump:

Here's an update on the betta: we dosed the water appropriately and tried adding salt but that didn't seem to work because the bulge has just gotten larger. On the other hand though the betta is acting much healthier and is more active despite the growth. Any ideas?


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