I agree with Matt. It is a congealed infection. Tylan 50, 1/2 cc in the breast every day for 3 to 5 days. You can get it at Tractor Supply, get 3 cc syringes and 20 ga. 1/2 or 3/4 " needles.
Tylan 50 $9.99
5 syringes $1.99
5 needles $1.99
Tylan 50 $9.99
5 syringes $1.99
5 needles $1.99