Sorry Sally but I don't know. I haven't put very much research into diseases.
I was wondering about my gosling's navel. I took pictures this morning, but I couldn't get a clear picture of her navel no matter how hard I tried so I'll just describe it. Her navel goes out a little bit and then meets a small black mass. After the black mass is my piece of green yarn where I tied her cord. The black mass seems to be preventing her navel from closing, but it's very much attached. Is there anything that I should do?