I got some Khaki Campbell ducks last March. They have never had an medical problems, nor have my other ducks besides my late disabled Pekin. When I went to collect chicken eggs and check water when I noticed that one of the female Khakis had a foam like substance on the corner of the left eye. The foam looked like soap suds. I caught her and gently removed the foam, and the foam didn’t refurn. I didn’t see any more a few hours later when I went to put the ducks and chickens up for the night, and I’m going to check again when I let them out in the morning. I didn’t see anything wrong with her eye. My wild Muscovy did fly into the pen where I keep my birds and did fly at one of the Khakis, but I didn’t see any injuries on this female when I caught her. I’ve had ducks and chickens for a few years, and have dealt medical problems with a disabled duck and a chicken that had a possible brain problem and a huge infection, but I have never seen this before. I want to know if this is something I need to treat, or is something that I shouldn’t worry about. If I see it again, I’ll post a picture. Any advice about this, or other medical problems will be greatly appreciated.