What color is the horse? What/where are any white
markings?
If the "crusty scabby thingies" are mainly in the white
areas, or the horse is a light palomino, it could be a condition caused by an
allergic reaction to a combination of sunlight and some kinds of clover.
We had a couple of these over the years. A dark
chestnut mare had them when we got her, came off heavy clover pastures.
With a change in feed she got better, they were no longer inflamed and sore but
the scars stayed. Got a small flare up sometimes in the summer if the hay
had some clover.
A light colored palomino with very little white
would get them on his sides, and rump in the summer only. If we kept him
in the barn always during the day in the high sun months he could use the
pasture year round.
Nothing we applied seemed to help much, just a change in
diet/exposure to sun.
I think it's a kind of "photosynthesis"
condition??
Do you have clover in your pasture? White clover
sometimes causes skin, especially white skin to be super sensitive to the sun
which will cause scabby sores on the legs and sometimes on white
noses. I scrub affected legs with a betadine solution mixed with
water, trying to loosen the scabs, then treat with nitrofurazone
ointment. I had one mare with four stocking legs that had the issue
frequently.
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