I have recently noticed that my horse has bumps along her back under her coat. At first I thought this was a major case of dirt due to her paddock being quite muddy and her rolling. Although now after reading some other posts on the subject, I am convinced it is rain scald.
I don't have a photo - But basically they're hard-ish bumps/scab looking things, deep into her winter coat. I had originally tried brushing it out, but as soon as I realized brushing didn't help much I gave her a proper wash, and noticed it loosened it a little bit and some came out, but she still has quite a bit there.
Is this rain scald, or something else? And what kind of treatment can I use on her to get rid of it?