OK, couldn't get the picture off my phone, had to wait until I got home to the computer. It's below.
For months, it just looked like the flat dry-skin patch you see in most of the picture. About a month ago, it sprouted a pea-size nodule in the front. Vet wanted to watch and wait to treat after flies were gone later this fall. Then literally in 24 hours, the pea exploded into this huge, nasty sore. It was dripping blood when I got there tonight and obviously very raw.
Vet coming tomorrow morning to assess our next steps. I still would love any suggestions on how to bandage, if necessary, in this particular location. I think probably we're going to need to move forward with treatment (he's leaning towards the topical Aldara option
), but I'm not sure given the flies. Thanks for any thoughts on your experience with this or more general advice on keeping the "armpit" protected and clean.