I went out to check the feeders, and as is often the case, there was a Douglas Squirrel sitting at the sunflower feeder. They're used to us, so he let me get fairly close.
I saw that he had several black spots around his neck and face. When I got closer, I saw they were black bumps or warts, clumped together in a few spots. I haven't seen this on any of the other squirrels in our yard, but since I usually see them from a greater distance, I don't know if any of the others have these.
Do you have any idea what this is? Is it contagious to other squirrels, wild birds, cats, or dogs?