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