Purpura hemorrhagica of the horse is an acute, non-contagious disease probably arising from septic bacterial intoxication. It is characterized by extensive edematous swellings of the subcutaneous tissue and petechiae on the mucous membranes and internal organs.
Stanton, Harlan M.
"Purpura Hemorrhagica of the Horse.,"
Iowa State University Veterinarian: Vol. 6
, Article 12.
Available at: https://lib.dr.iastate.edu/iowastate_veterinarian/vol6/iss1/12