My 2 year old Speckled Sussex had a huge tumor (?) On her lower left front breast. It is hard. Lots of veins in it. My husband remarked to my daughter about a week ago he thought she had a growth, but we thought he was talking about her crop. Picking her up tonight, we found this, probably the size if a large peach. Any idea what this is?? Really hoping it isn't Mareks. We haven't added any new birds for about 9 months, when we added a flock of silkies. An y Any is greatly appreciated!