I had a horse get something just like this in his ears and at the base of his tail last summer. I completely freaked out because I thought bugs were laying some kind of egg in him. If you squeezed the little holes, a hard white/yellow egg like thing would come out. Except that it was too small to be one of those like cattle get.
I had the vet out, and they had never seen anything like it. We did swab samples to run a culture plate, skin samples, blood work, took samples of the "egg things" and a general physical because I was concerned it could be contagious.
Results were a staph infection. The little holes with hard things were mini abscesses. They thought it was probably brought on by flies, gnats, and stress from staying at his flood refugee home. It is technically contagious to "at risk" animals and some humans.
The treatment was a week of antibiotics, complete cleaning of the wound to remove the abscesses, as well as daily washing and dressing them. A fly mask with ears and some duct tape over gauze for the tail worked.
I have photos, but I'm at a show in MN. I don't know if I'll be able to get them put up before Monday,
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