My betta all of a sudden got this big white abscess on his side. He previously had dropsy I think, so I've been doing small water changes twice a day after I feed him so the water's super clean. He has been getting kanaplex through his food. He looked fine this morning, and his scales were starting to pinecone less, and go back to his side, but then I went to feed him just now and noticed this. He isn't using the fin on the side with the thing. He still is eating well though. He seems to be leaning weirdly towards the thing also. I don't know where or when he would have gotten injured or anything. Does anyone know what it might be and how I can treat it? I attached a few pictures so hopefully that will help.