If this can not be done, apply camphorated oil two or three times a day until the core is formed.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
camphorated spirit, soap liniment, and essential oils also afford some relief when applied locally.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
If, on the other hand, there is little or no fever, and only a slight inflammation, rub well with camphorated ointment or a weak iodin ointment, and milk three, four, or six times a day, rubbing the bag thoroughly each time.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler