The reddish nodules with which the membrane is beset are tubercles, the product of the disease.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
Later larger nodules can be felt within the udder, which undergo the various changes to which tubercles are subject.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
nodules may also form under the serous covering of the intestines.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler