Our hen has been favoring one side a little more than the other. At first I though she might have had coccidiosis which as run through our flock more than once since we live in a wet area. But my wife noticed that she has what looks like a abscess of some kind near her should by her wing. I have added pictures. Does anyone have any idea what this could be? I treated her with Corid for a week and that did not help. Now she lets her wing droop and she doesn't stand unless approached.