Yesterday I noticed one of my broody hens had a chick that wasn't acting quite like usual. It had gotten separated from her and it was a warm day, so I put it by a waterer and it seemed like it was very thirsty. When it finished drinking I checked it and returned it to the hen. Even after it was back with her it just kept peeping loudly so I gave them some chick starter and it ate some and seemed better. Last night it was crying loudly again, I always give them extra food when they go in for the night and it was eating and quit crying. This morning it was crying again so I checked more closely, I felt its tummy and there is a lump, almost like the yolk may have turned hard inside? They are about 2 weeks old and when I looked closer at the abdomen I found something I have never seen before. Does anyone know what it could be and how or if it can be treated?