If you haven't added ducks yet, I wouldn't. I love my two ducks but if I had known how messy they were going to be I wouldn't have made the commitment. And they take LOTS of water. We have a 4500 gallon pond and duck house. I have to change their drinking water daily, spray out their house about...
I've searched everywhere and am so thankful for this post. Our chicken has this same issue right now. One large blister on her face. She does not have any other symptoms, no coughing/sneezing/raspy breathing so it does not appear to be MG or coryza. Another girl had one of these about 3 months...