Oh, and I have already tried MTG... they are both hyper-sensitive to it. It only made it worse and I discontinued use.

I don’t exactly know what “Rain Scald” means in veterinarian terminology, but from the symptoms that you describe looks kike the same problem I’m having with one of my mares, although mine is not as extended as yours seams to be.
I was suggested to treat it with sulphur powder (the yellow one used in agriculture) melted in oil (olive oil or whatever vegetal pure oil). Very cheap, no vet bill and looks like working all right.

Thx for your suggestion Bruno, but Sulfur is one of the main ingredients in the MTG that I used on them that they showed hyper-sensitivity to so I probably shouldn't use it. I hope it works like a charm on your Mares...
Anyone else have any home remedies or advice?

rain scald is often caused by a bacteria (dermatophilus congolensis) that thrive in wet and damp conditions. the most improtant thing is to keep the coat dry so if necessry keep stabled in wet weather. then you can wash the area with hibiscrub or an other antibacterial shampoo. if necessry the horse might need a course of antibiotics for 7-10 days. one shot is not enough.

They were on Uniprim Antibiotic for a week, Griseofulvin Antifungal powder for two weeks, have been kept in the barn out of the rain and only turned out when the weather is decent. They have been bathed in Antifungal/Antibacterial Shampoo. I have tried a combo of Betadine, Mineral Oil, and Glycerin that we used at the Breeding Farm I worked at,MTG which everyone down here SWEARS by,Muck Itch, and Lotrimin Spray...not simultaneously of course. Vet also had me applying a thin layer of Thermazene for about two weeks which I suspect has only made it worse yet, so we discontinued that as well. NOTHING we have done has led to ANY improvement whatsoever. My mare has had this problem for a little over a month now, and my Gelding for almost three weeks. If theis keeps up they will soon be bald. :-(

When my sisters horses had scratches really bad one wet spring she was advised to try just putting Desetin diaper cream on it and it seemed to clear things up. If nothing else it will keep the bare patches from getting sun burned since it has zinc oxide in it. Could be worth a try since you seem to have tried lots of other things. Good luck.

Vet called me this morning with the results of the Biopsy he did on my Mare last weekend and there is no longer any trace of Dermatophilus Congolensis. He said that what they are experiencing now is just Alopecia (hair loss) resulting from their Immune Systems being so taxed. He says he thinks they will blow out their entire hair coats and start all over again. Thank God it's getting to be Spring here... What a nightmare! Never in all my years have I ever seen anything like this... Crazy. Thank you all for your suggestions.

Update: My Palomino's hair is growing in MUCH MUCH darker... he is going to end up looking like a Paint till it bleaches back out in the sun. My Mare's bald patches are barely visible now that she has some peach fuzz growing in.. and no more hair loss other than normal springtime shedding. Thank Goodness the hair is finally growing back and they're getting better! WHEW...

Glad to hear things are looking up. Just for your information, when we run into any skin problems, the first thing I try is tea tree oil. You can put it on directly. It is especially good for fungal infections, like rain rot. I don't know how it would have worked in your situation, but it's something you might want to keep on hand.

Hi Gaiagirl, hopefully your problems are all over now, but for the future reference if you need it. I have used the following for very severe mud fever: potassium iodide dissolved in a little water and added to the feed with a good handful of white sugar (it is extremely unpalatable).
I have a chestnut Arabian gelding with 3 white socks, one leg only appears to be allergic to all topical treatments except Aloe Vera (which is soothing, but does not clear the problem)and the Potassium Iodide. His other legs and those of his full brother respond well to Noof Oil (an Ayurvedic treatment).Both these horses get a bad response on their white areas from Tea Tree oil. Hope you don't need it, but if you make a note you will have it for future reference.
Val.

Hi gaiagirl73, I don't know where you live but in Queensland Australia where I live the horses here often suffer from a condition called Queensland itch, which is similar to rain scald. My horse suffered terribly and I went through the same various try this, try that regime but in the end I found if I washed it daily in this product from Aristopets called stop itch (iodine based), followed by a good dry then a light spray with a tea tree based insect repellent, I had it under control in no time. Also rugging is a must! Hope this helps.

Thanks Y'all.... I really appreciate all the help. :-)