Well, hasn't been a good week for my birds While treating with Tylan 50 last night for respiratory illness, I noticed my barred rock hen has a softball size mass under her skin on her lower abdomen between her breastbone and vent. It is kind of soft. I haven't gotten any puctures yet. She is acting pretty normal but I don't think she has laid an egg in several weeks. I thought this was because the flock is going through a molt. But I am not sure if she has molted yet. Her fluffy butt hid the mass until I was able to palpate it last night. I am wondering what are the most common things that can cause such a mass/growth. It is pretty round, like a softball, and not very hard. It doesn't seem to bother her that much. Ascites? Tumor? Internal laying? Anyway to tell besides necropsy or xray? My closest avian vet is an hour and a half from here. She may have diarrhea as some poo is on her feathers below her vent, but this could be because of the location of the mass or related to the illness the flockbis having. I am keeping her inside for observation right now.