Brown spots on fin and under face

[momsspaghett]

Hello. I recently have looked over my betta and have noticed a brown spot on his fin which looks like algae or fungi. Under his face is also pretty brown, looks like lack of scales growing because of it. Any idea what may be the problem?

 

[Abaddon]

The black area under the chin looks just like normal pigmentation tbh. I don't see any scale loss - they're there, you probably just can't see them individually because they're so dark. The spot on the tail, however, does look abnormal - maybe a mechanical injury that got infected? Or very early stages of fin rot? I honestly don't know what it could be. Keep an eye on it & make sure the water parametres are perfect. Maybe add some catappa leaves (or extract), it helps relieve stress & has antibacterial properties. Hopefully it will heal on its own, but if it doesn't, do let us know.