I am no expert, but from a quick google search, it looks like doxycycline is safe for chickens. Dosage is 10-20mg/kg. If you need help converting that dosage, lmk your chicken's weight and I can do it for you.
It does look like an infected cyst to me, too. I would definitely do antibiotics to see if they help before putting the chicken down.
It does look like an infected cyst to me, too. I would definitely do antibiotics to see if they help before putting the chicken down.
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