hello! My names Jessie, I have had chickens and ducks for 3-4 years now and I have never seen this! A few months ago I got a pair of these beautiful dark brahma girls for breeding with our dark Brahma cockerel, unfortunately before we got the chance to breed them the male Brahma died, anyway, after the boy died we noticed one of our Brahma girls had some symptoms of mareks disease so we took her to the vet and they said she had it and asked if we wanted to uthanize her but I chose not to because I had a feeling she would be okay, and by my surprise she got better almost instantly and had been perfectly fine ever since, but the other day we noticed she was distancing from the rest of the flock, sleeping allot, not moving much and she smelt very strange, so I kept an eye on her and today I noticed that she was very unbalanced and when I took a closer look it was as if she was trying to get something out of her neck, she began to sway her head from side to side and up and down and jerking it but nothing was happening! I set up an enclosure inside the house for her away from the flock Incase it was infectious and so I could care for her, and I have gave her some food and vitamin water and she stopped doing it for a while, and was very alert and eating and drinking but then she starting doing it again! I felt around her neck for anything like an impacted crop or an infection like sour crop but I really can’t tell what is going on, I’ve googled as much as I can and I can’t find a single thing on this. Anyway, I felt around her neck area and I noticed she had a lump on her upper neck, as if a bone is sticking out of her neck (I have attached photos of the lump in her neck below), she still seems very calm and is currently sleeping but I’m so worried that it’s something bad, I had a look down her throat and I can’t see anything stuck and her crop is very empty. (Btw the lump is at the top on her neck)

Any help would be appreciated, she is a lovely girl and I’m not sure what to do to help her!