My almost three year old female Muscovy duck began showing one sided swelling of some sort around her bum about a week ago. A few days later she began laying her next round of eggs. But the lopsided bum stayed. It hangs low on that side. Today she made another egg in the early morning but by the night she was swollen and low again on the same side, and looked like She was to make another egg soon. But she won't sit down. I think it hurts her or is uncomfortable. I have tried massaging her and i have tried putting oil up in her opening with a plastic syringe. i have also applied heat. i just checked on her now and she still isnt sitting and there is not egg. Does any one know what this could be? Is this just from her laying? She is normally a good layer but has experienced a few difficult eggs when laying. She is not very hungry at the moment eating just a small bit, but she never usually eats much until she lays. she is still drinking water and acting fine, just a bit more tired like she is when shes laying. Help please!!! I can't find any info online.