Scratch by eyes?

The other day I noticed one of my boys had a few punctures by his eye, like he had been scratched. I didn't think anything of it o figured one of the boys got him while they where playing, and no one else had any marks so I let it go.
Today I noticed not only does he have the same thing on the other side of his face but another boy has a scratch by his eye as well.

I've checked everyone else and they don't have any marks anywhere on them and the two boys with the scratches are fine everywhere else.

I haven't noticed any of them itching more then usual or any unusual fighting either

Any idea what could be causing this would be helpful!