It started with my daughter's steer and we quickly treated it with Athletes Foot cream and it was gone almost as soon as it started. Then the heifer got it and she has it bad. We have been treating her the same way and its not going away. Someone suggested pour on Ivermectrin, but Ring Worm is a fungus, not a parasite right??? Its seems like since it started raining a week ago, it has spread worse and she seems more itchy. What can we do?