Welcome!
How old are your birds, and how many do you have? Cockerels (males under one year of age) do need to learn how to behave, and pullets (females also under one year) mature later than their male flockmates, so aren't interested in them until they are laying eggs.
If you have an adult rooster with hens, and he's injuring them, that's not good behavior on his part, and might be a reason to move him on.
Molting birds can look pretty rough, and aren't to be confused with birds injured by mating behavior.
Mary