Hello! I am rather new to the betta world and my current betta, Proteus, is the only one I have ever owned. I have had him for around half a year now, though I have noticed that he has some strange growth on his side. I think the lump appeared around 2 or 3 months ago, but I had assumed it was just some kind of cyst that would eventually drain out or gradually shrink over time. This does not seem to be the case, however. Just today, I noticed that the lump seemed bigger and almost looked like his skin was ripping a bit. My betta still seems perky and lively as ever, he just has this strange bump on his side. I don't know if it is cancerous or life-threatening, but I decided to finally join a site and create a thread about it. Any ideas on what this lump may be? I have a picture attached below. The dark spot on his side is the tumor in question.
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