I noticed my yearling had 3 quarter sized, fluid filed bumps on his back. One near his withers and one on his hindquarters, so quite spread out. They were easy to peel off, but soft and not scabby or flakey. They came off in almost a perfect circle, and left a round patch of fresh pink skin underneath.
My other horse had them about two weeks ago, but they were much smaller in size.
Anyone know what they might be?