I noticed today the original spot appeared to be getting bigger, so I thought maybe he got a spider bite.

But as I took this picture, I found two other spots on the same leg where this crap appears to be starting:


His ears are getting pretty crusty from running in the briars, but nothing like this and the other front leg is fine. I picked up some 10% iodine and started using that today. This is the same poor dog who had the e-rich over the summer (different leg). I could probably get him to the vet Tuesday, but thought I'd check if anybody could give me an internet diagnosis/recommended treatment first. Thanks in advance.