There's something deeply unsettling about a chick with swollen feet, and I don't just mean the visual of it, I mean the way it makes you feel utterly helpless. This one-month-old Onagadori is eating, drinking, and walking, but those red lesions and yellowish spots are spreading, and the little thing can't stop scratching its head. Our take? Don't chalk this up to hay allergies just because you can't find anything online. Hay allergies in chicks are about as common as a rooster who apologizes after crowing at dawn, rare, and usually not the real problem.
The fact that the swelling is soft, painless, and creeping up from the feet to the head points more toward a viral or bacterial issue, possibly something like fowl pox or a staph infection, rather than an environmental irritant. And here's the thing, you said you've never had a sick chicken before, which means your flock's immune history is a blank slate. That's not a comfort; that's a warning. New birds, especially purebreds like Onagadoris with their quirky naked necks, can carry things you've never seen simply because you've never had the chance to see them. We've talked before about weird chicken noises and odd egg colors in Why Is My Silkie Sounding Like a Tiny Trumpet? Let's Chick-splain and When Your Olive Egger's Eggs Taste Like a Fowl Mood, and the common thread is always the same: chickens hide their problems until they can't, and then they expect you to be a detective with a thermometer.
Now, about that hay theory, let's give it a fair shake. Hay allergies do exist in poultry, but they usually show up as respiratory distress or skin irritation on the chest and legs, not progressive swelling with lesion clusters. The scratching at the head is the giveaway. Chicks scratch when something is biting them, crawling on them, or when their skin feels like it's on fire from the inside. If it were hay, you'd see more redness on the belly and thighs, not a pattern that starts at the feet and climbs. So what should you do? Separate the chick immediately, not because you're panicking, but because you're smart. Then, take a close look at the lesions, are they crusty? Blister-like? That distinction matters more than any internet search. If they're crusty, fowl pox is a real suspect. If they're weepy and yellowish, think bacterial. Either way, a vet who actually sees birds is worth more than every forum thread combined.
Here's the practical takeaway, and we're not going to sugarcoat it: you need to quarantine this chick today, not tomorrow, and you need to call a vet who treats poultry, not a general dog-and-cat person. The good news is the chick is still active and eating, which gives you a window. The bad news is that window closes fast with chicks, and the difference between a mild infection and something that wipes out your whole flock can be just a few days. So, while you're waiting for that vet call to go through, keep an eye on the other chicks. If any of them start scratching or showing even a hint of swelling, you'll know this isn't a solo act. And if that happens, well, you'll have your answer, even if it's not the one you wanted. For now, let's hope it's just a weird genetic quirk, because that naked neck is already enough drama for one bird.