Vet#2 is a good friend of mine, we talked at length over the phone and I sent him blurry photo's shown below. He had few ideas.
Vet#3 was sent the photos as well but wouldn't comment until he sees the horse in person, set appointment for Saturday.
This photo is of a patch is missing hair, and is still weeping serum.
This is Star's topline, he has been wearing a blanket, so the serum has soaked into the blanket rather than hanging in icicles like it did before he was blanketed, but the extent of the lesions can be seen.
This is a patch that has lost the hair and is no longer weeping serum.
The photos of the swelling didn't turn out very well so I didn't post them. It is winter, very cold lately, so bugs really are out of the question. The horse is 18+yo. Any Ideas would be appreciated!