I'd get some ointment for athlete's feet and lightly coat the comb..
could be some Favus going there..(fungal infection)
I think the eye's need watched..could be peck marks..
some terramycin eye ointment..or if not right in the eye or too close..regular antibiotic ointment, such as neosporin..not with any "caine" in it..or for pain..just plain neosporin..
you say he's thin...
has he been wormed? if so, when? and what was used?
has he been treated for mites/lice?
how old is he?
what all do you feed?
do you have another rooster?
how many chickens do you have with him?
have you done a good check of his crop?
it would be a good idea to use a small flashlight and check his mouth and throat for any whitish or yellowish sores or plaque, or sour smell..
describe the droppings in detail..color and consistency..
does he have a good appetite? is he drinking?
any other symptoms... such as wheezing?sneezing, shaking head?
watch closely..roos are famous for hiding illness until it's severe.