Look like cannibalism. Try some BluKote or Pick-No-More lotion. It makes the skin a dark blue/purple color so that the other hens/roos don't peck at it. But beware, use of the BluKote may result in your skin getting some color too!
Looks like mine, you must have more than 1 rooster. I use to have 12 hens per 1 rooster then the coyotes and racoons took care of that problem, until I built a better coop.
Looks like a rooster problem to me. I will post a pic as soon as I can and you will see it is the same thing.
Do check for lice but I think it's molt time and a rooster that's mating alot. I take my roosters out for the day when the hens start to look ragged and only let them back in at night to roost with the hens.