We have had great success with rubbing bag balm mixed with cayenne pepper(Lots of it. It should be red. Don't get it on your hands or touch your face. Use gloves to apply it. ) on our Jersey's back quarter's at the first sign of hardening. We did this 5 to 6 times a day and after each milking. We also massaged the hardened quarter many times a day as well. We avoided any antibiotics by this method. We also increased milking to 4 times a day to flush her out and just discarded the milk as well. This cleared her up. It wasn't easy. The first 3 days were rather hectic but it was worth it, as we didn't have to use any meds on her. You could see the look of relief on her sweet face. In the end, it was so good knowing that we didn't use chemicals on our organic cow. It was all worth the extra work and of course, her health!