There was another post here last night with a very similar picture. I noticed it because I, too, have a rooster with the same eye. My rooster's comb has sores on it, too, actually scabs.
The responses to the other post mainly pointed toward fowl pox. I looked it up, and I'm pretty sure that's what my rooster has. Maybe you should look it up, too. I hope you get some answers - and that your chick gets better soon!!
Susan