One of my mama cows has a wart developing on the tip of her ear. It is about the size of a dime, and is starting to get thick (at least a quarter inch) I read that warts come as a result of fly tagging, and usually disappear after a few months, but #14 developed this wart well after the tags were put in, and I really have no idea of how long she has had it. I do know that the thickness has changed since I noticed it a while back. What do I do about it? As far as I know it is the only one on her, and I don't see evidence of it in the other animals.