I don;t know wha is wrong with my rooster

[Baby rooster]

I am not sure if is the food he is eating or something else, his comb is getting some black stuff that I don't know what it is, he still eating good and his habits didn't change just I am worried because everyday he has more black spots

 

[faykokoWV]

usually the black spots are bruising - do you have more than one rooster? It could be another roo or a hen pecking at him that is causing his comb to bruise