Rain rot is also known as rain scald and on lower extremities is often referred to as mud fever.
Being you make comment about this being a ongoing problem I would be concerned something is missing in the diet
Healthy horses should not be plagued by rain rot.
Stressed or not...once in a great while, not often should it affect a animal.
Original Listerine, and store brand/generic works as well as the expensive product. No to the MTG
... many horses sunburn from it and get serious reactions and you said 24/7 pasture gives her much sun exposure.
A anti-bacterial shampoo and if you can remove scabs, do so those that are loose so the underneath skin can heal better.
Rain-rot can be bacterial or a fungal infection of the skin... left untreated properly it can spread to many more areas of the body.
Rain rot is
contagious horse to horse and by us humans sharing of grooming tools, halters and such that are infected between animals.
Cleaning, disinfecting of brushes needs done as well as each horse has their own brushes and a periodic cleaning of brushes is good practice too. No sharing of anything,
not tack, not halters, not brushes...not blankets.
I found you some articles so you can better understand what it is the horse[s] are dealing with.. https://thehorse.com/180660/dealing-...rot-in-horses/ https://thehorse.com/122494/rain-rot...nd-prevention/
<img style="max-width:100%;" src="https://www.horseforum.com/images/smilies/runninghorse2.gif" border="0" alt="" title="Runninghorse2" class="inlineimg" />..