Hi, I have a 9 year old thoroughbred gelding. He has developed some scabby lumps on his shoulders that have now seemed to move down along his back. The lumps come off with the fur and leaves a weepy sore. He is rugged most of the time so I'm pretty sure its not rain scald. He is otherwise in really good health with a very shiny coat. Just wondering if this could be a fungal infection and what I could do about it. Thanks