Oscar, wierd markings

I came home from work and noticed these markings on the side of my oscar. To the best of my knowledge these markings were not there yesterday. There are 2 red spotted severums in the tank with him/her right now. The Oscar is 5" and the severums are 3.5".

My parameters are really good and are always really good.

I checked just for this thread and tight now I have:
Ammonia 0ppm
Nitrite 0ppm
Nitrate 5ppm.

Are these marking something to be worried about?

By the way the markings im talking about are close to his/her gills.

 

Have you noticed any aggression from the other fish? It looks like it could be from bullying. It doesn’t look like any sort of disease but others might disagree

 

Have you noticed any aggression from the other fish? It looks like it could be from bullying. It doesn’t look like any sort of disease but others might disagree

Actually the oscar is the bully lol. Its not like crazy aggressive but he definitely let's the severums know who is the boss of the tank. He just chases them away sometimes no biting or anything. But maybe one of the severums decided to fight back while I was at work.

 

Probably because it doesn’t look like any sort of disease so just keep an eye on it and it should clear up in a couple of days

 

Could you get some better pics?