I was recently given my first horse. She's a beautiful 3 year old bay quarter horse. I groom her everyday and frequently spray her with fly spray. A few weeks ago I noticed a bald grey spot on her back. My first thought was rain rot. So I went and bought her some stuff that treats rain rot. I've been treating it everyday like the bottle says but I'm not seeing any improvement in fact I've been noticing MORE spots! Some on her face, above her eye, and on her belly, they just keep appearing!! I'm worried about her. I want to make it better but don't know how! Is it rain rot or something totally different?? Please help!