I was moving the divider in the aquarium since the current was too strong for my little ones, and my oscar freaked out. Smacking his face multiple times on the glass, then some how he scratched his head. I've never seen bruises on fish, nor do I know how to deal with them. I figured it's just something that heals over time, but I was told to check anyway. They're located on his chin and one by his gill slit. Aquarium salt is not an option, I'm pretty sure my scaleless fish and snails wouldn't be too happy with me.
Here's a few pictures of Oscar;
Here's a few pictures of Oscar;
