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It could be a tumor. I don't think it is the result of a wound. Wounds usually heal relatively quickly, and don't get bigger unless whatever is causing the wound is still causing it (for example, an external parasite at that particular location, but you would see evidence of parasites elsewhere). For tumors, sadly, there is little you can do about them. My first female had a tumor and lived quite happily (for a fish with a tumor) for about 6 or 7 months before it got so big it caused swimming difficulties. She showed no other signs of illness before the tumor caused her to lose her ability to swim. At that point in time, I lowered her water level significantly and kept her as comfortable as I could. Even then, she still had her spunky attitude for about another month. After that, it was obvious the tumor was causing her discomfort, she only lived a few weeks after that.

Keep an eye on him, and watch for other signs of illness. If it continues to get bigger, watch him for signs of discomfort, and then make him as comfortable as possible before either euthanizing him or letting nature take its course.
 
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