So, last night I was just messing around with Ice while I was tacking him up, just rubbing his stomach and stuff while I was tightening his girth when I noticed about two or three inches behind where his girth is there was some kind of scab formation. It was maybe three inches long, and it was a single straight line. It was right at the apex of his ribs--basically the dead center of his stomach. Obviously it was kind of hard to see, since he has his winter coat and I can't exactly get down under there to look. On top of that it was dark, lol. But I did manage to get a flashlight and get the best look I could. The scab kind of looked like it had a reddish tinge to it, but I can't be too sure. I'll try and get pictures of it, but I can't promise anything.
So does rain rot usually show up in clusters, or can it show up in a long line like that? The scab did feel big, like it was layers, but it wasn't very flaky. It hasn't been ridiculously wet here, and when I give him a bath I let him graze and sun dry and I always make sure to scrape him really well.