I remember one to which I was called as soon as the owner noticed it, yet I found one-quarter dark blue, cold, and showing a tendency to the formation of Blebs containing a bloody secretion.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
It is not uncommon to find over the ecchymosed area, especially over the shin-bone, large Blebs containing blood-stained serum.
"Manual of Surgery Volume Second: Extremities--Head--Neck. Sixth Edition."
Alexander Miles Alexis Thomson
The inflammation spreads rapidly, and there is formation of Blebs with much itching.
"Aids to Forensic Medicine and Toxicology"
W. G. Aitchison Robertson