Comb - what are these markings?

[Dreamleaf39]

I just noticed what looks like tiny scratches on the comb of my French Black Copper Maran, Chaps. She's been quarantined for a week because she had bumble foot surgery, so I don't think it's from another chicken (unless it happened over a week ago but I think I would have noticed before now). What do y'all think these little "scratches" are?

 

[Eggcessive]

It could be from fly bites, since they are so tiny. Also he could have scratched it on something like wire.