My girl and I bought our betta, Squeaks, in September. He's been an amazing fish and I love the little guy. Awhile after we got him, we noticed a small red dottish looking thing on his front left fin. His right fin is perfectly white/translucent, but the growth on his right fin has grown a bit over time. I can't get a good picture of it, but I know it's not fin rot or anything as we take very good care of him.
It's just this freckle-looking red growth that looks to be slowly taking over his left swimming fin (not tail fins). I can't find any info online or anything. Please help!
Here's pictures of him in action if anyone wants to see: