Hi. I’m new to this forum because I’m desperate for help. A couple weeks ago I noticed that my betta had a very small bump on the side of his head, but I didn’t think much of it. The bump kept getting worse, and eventually his behavior started to change. He still eats fine, but he’s been laying on his side in his rock a lot and is a lot less active. I called a pet store and they told me that my fish has a tumor. However, today it started to look more like a sore, and I noticed red streaks by the side of his face where the affected area is. I read online that septicemia can cause red streaks on the body and ulcers, so I’m not sure if it’s that or if it’s a tumor. I was going to let the spot go untreated, but if it’s something else, I want to be able to do something about it! I attached a picture of what the spot looked like yesterday and then today, as well as a picture of his his good side for comparison because to me, I see red streaks on one side but not the other.