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  [RC] mystery bumps on horse - Sharon HahnIt could be the girth, too - especially if you use something "non-breathable" like neoprene and your horse gets a localized heat rash under the girth. 
I get terrible itchy red welts on my ankles from the elastic in my socks on hot summer days when I wear half chaps and my ankles can't breathe.  It will last for a week after the ride!  The rest of the year my ankles are fine.  Diabetic socks without elastic helps! -- 
 
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