Hello, my buff orpington has these black areas on her comb. Actually my other buff orp does too but not as much. The remaining 3 hens (other breeds) are fine. The temps here haven't dropped below 25 degrees at night (40s in the day) so I would be surprised if it's frostbite but maybe? I had a red heat lamp going on in the coop at night on a timer - it would turn on for 15 minutes once at midnight and once again at 3am. I did notice condensation on the inside of the windows in the morning when I would let the chickens out into their run. Then this morning this same hen had some blood on the tips of her comb. I wiped it clean and put antibiotic ointment on it (and the other one's comb too). They are otherwise acting normal - eating and drinking and pooping and laying. Also, I have turned off the heat lamp and am cracking the windows to make sure the ventilation is good (no more condensation now). Any ideas what this could be and how I should treat it? Thank you in advance!