I bought a filly off of CL. I grew up helping my dad train horses he fostered from the SPCA, so I figured a filly would be easy since she was trained. She was NOT trained, liars on CL (shock). So she was fine in the trailer and getting out. When I got her in the pasture, she went nuts. I called the man and he said he NEVER worked with her at all! Well I have her halter trained, working on Leading, she stands to be groomed, and lets me mess with her feet. Well the other day I was doing a full groom using all my brushes. I went over this one spot and she had NO FUR. It was a huge scab. I called my mom and showed her a photo, but she doesnt know what it is. I sent it to the lady who trained me in Showing, and she said its a fungus of some sort. I am turning to people who might know more. Its a good 2 inch by 4 inch (maybe) scab looking thing, but the scab is coming off in pieces. In the photo, it doesnt show all of it, just the biggest section of it. It goes back a few in the hair. Its on Flickr. Ill post the link. vixensore | Flickr - Photo Sharing!
If yall can give me a clue as to what it is, and how I can treat it, let me know :)