Any idea what could be wrong with my chicken? the area around the eyes/head is blue colored. comb is pale looking. she/he has been active until today. now sleeping,, lethargic. this one is a buff orpington from a npip breeder. she/he has been separated with a white orpington for about a month from the rest of flock. i built a larger coop/house for 25 chickens and when i put them all in, these two were the smallest and were getting pecked at. they both are about 1/2 the size of the rest of the flock but were supposedly all born the same hatch. the white orpington seems ok but chirps all the time. i think the buff was chirping a lot too but right now, just sleeping.
any help is greatly appreciated. what can i check on her? i have corid. do i need antibiotics?