Hemorrhagic septicemia may be differentiated from blackleg by its affecting cattle of all ages, by the location of the swelling usually about the region of the throat, neck, and dewlap, by the soft, doughy character of the swellings without the presence of gas bubbles, and finally by the characteristic hemorrhages widely distributed throughout the body.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
In debilitated animals and in some animals highly infested with parasites there is swelling of the dewlap or of the fold of the skin between the jaws.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
These tumors in cattle are frequently found upon the dewlap as solid lumps, hard as stone to the touch, lying loosely between the layers of skin, and gradually losing themselves in the softer tissues of the neck above, or as smooth, hard tumors of glistening white substance with interlacing lines of softer tissue.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler