The first of these is the practice of «soring,» using caustic substances, chains, and other forms of pain to force walking horses to use an exaggerated form of movement that is prized in the show ring. (drmartybecker.com)
With caustic substances, flush the area by holding it under running water for 15 minutes. (soonervet.net)
This also helps remove caustic substances (acid or alkaline) if these are the cause. (soonervet.net)