If it is frostbite, I suggest rubbing on some vaseline. Since he has such a big comb, he is at a very high risk for it. See if that helps it go away at all, and if it doesn't I don't know what to tell you. :idunno
I have always brooded indoors, however, if your barn is free from drafts, I do think you may want to give it a shot. But make sure that you have a good heat source to keep your birds warm.
Hello, I am so excited to join Backyard Chickens! I have 9 beautiful birds, and I am getting 8 more in the beginning of April. (I will be sure to post pics of my new chicks!!) I have had a few of my girls for about a year and a half, and the rest for about 8 months. (I hatched the latest group!)