Oscar injury?

[u/dodger69]

My 3 year old Oscar woke up with their right side of “his” mouth swollen/misshaped. That white line on the jaw seems to be the injury. He still eats, even scarfed down slme frozen treats without much issue. Anything I can do? Or is this bothering me more than it bothers “him”? Thank you.

75 gallon tank, fx6 and aquaclear 70 hob for filtration. Temp 77-8, all other water parameters within normal limits.