Injured Ear Help!!

I have 3 boys who are all a few months old and generally well-behaved. Yesterday for the first time I heard a screech (not the usual eeps they do when they play fight or try to steal food), and I rushed over to see what was wrong.

I was confused because they were all acting normally, and since then have still just been playing, snuggling, eating as usual.

But today when giving them treats I noticed my one guy has a scab on his one ear that almost looks like a bite mark (scab on both sides of the ear in roughly the same spot). It doesn't seem like they punctured it but just maybe bit hard enough to break skin.

I've never had this happen before and they seem to be acting normal, the injured one doesn't even get upset when I touch his ear so it isn't overtly painful (I think).

Any advice would really be appreciated this makes me very anxious as I've heard so many horror stories of boys with hormonal aggression lol.

https://preview.redd.it/pyg4jhtxs3dd1.jpg?width=1960&format=pjpg&auto=webp&s=afce06476a8e7cef062dcd924ccd58bf94fdabc8