Thank you this was helpful as my flock is all between 6-8 months and I have been seeing these and getting concerned. I wasn't sure if frostbite would be so random but this post cleared that doubtThey are just peck marks. You don't need to do anything. Hormones are increasing at 6 months and so are attitudes. Even when the flock settles into it's groove, someone inevitably irritates someone else and they get a peck for their trouble.