We are not necessarily "BackYard" chicken owners, as we have nearly always had a flock of 20 or so hens on our 20 acres for egg production and insect control, but I love this website, and have implemented so many great ideas for our flock that I found here. But we are pretty experienced chicken owners, and pretty experienced chick-raisers. We have never encountered anything like this, though, and are reaching out for help or advice because we're awfully worried about one little chick we got recently. Last week, we purchased several RIR day-old chicks. All were happy, healthy, hungry, and thirsty when we got them home. On their second day, one chick started having some feces build up on her rear, looked like "pasting up." We checked her probably 5 times a day, and gently cleaned any waste off of her with a warm, wet cloth, then dried her off as best as possible with a soft dry cloth. She never stayed wet, and continued to eat and drink well, but she never stopped soiling herself. Yesterday (chick is 6 days old), while cleaning her vent, I noticed a very large bulge at the base of her neck. It is at the very base of the neck; it is off to the right side (just in front of and below her right wing), not in the middle of her neck. At first glance, I thought she might just have drank a ridiculous amount of water and overfilled her crop or something. Then I noticed that where I could see skin, I could actually see fluid sloshing around, VISIBLE THROUGH THE SKIN on her neck over this "bubble." This "bubble" as I'm calling it was mostly (85-90%) fluid-filled, with a little air at the top, too. She continues to eat and drink well, even though the "bubble" is just as large as when I discovered it 24 hours ago. She also continues to have the "pasting up"-type problems, and we continue to clean and dry her as often as possible (at least 6 times a day). She's smaller and less active than all her sisters, but is still eating and drinking well. Does anybody know what this could be? Will it be a chronic problem? Will it start affecting her quality of life? Is there any way to treat? We want to get her better, but certainly don't want her to suffer for a prolonged period. She doesn't seem really unhappy right now, just a little smaller and slightly less active. And she's definitely still eating and drinking well, so I'm hoping that this is fixable, and that she will pull through! I don't have a photo right now, but will try to post one tomorrow. Thank you, in advance, for any help or advice!