Well about 7 months or so ago we had a hen that had trouble laying. She eventually laid but a couple days later though she started getting weak and limping. Long story short she became very weak and I had to put her down. She was sick for 2-3 weeks. Fast forward to today. I have another hen that has for about a month had a sore on her back. I assumed it was okay because it appeared to he scabbed over and I thought healing. Just about a week ago she started limping. I started researching and found it sounded a lot like Merecks disease. I took her to a vet that specialized in chickens. He stated that there was no test for Merecks in a live bird. He checked her and said that the spot on her back was actually as big around as a tennis ball under her skin. He said it felt hot and may be a tumor or possibly a infected abscess. I had been giving her a half of a baby aspirin twice a day for pain since I noticed her limping. Now for two days I have been giving her tylan 50 injectable. I have been giving her 1 CC ( she is 4 lbs ) once per day. I've been giving it to her in her breast muscle. I don't like having to do it but hopefully it may help her. I separated her from the other birds and put her in her own coop. I plan on giving a total of 5 days of tylan 50, 1 CC per day. Afterwards if she doesn't improve I don't know what else to do. Today was her first full day after her first dose of tylan. I noticed no change in her or the mass on her back. I gave her second dose tonight. Her name is Emily! Would appreciate prayers and kind thoughts!