Mastitis is a burden to both people and animals and this is how I have dealt with it naturally. I had severe swelling and pain in my breast that would not go away. I also had been on an antibiotic that did not help clear my infection, so I decided to try something else. I had already used a very similar version of this for chest colds in our home, so after reading that onions could possibly help, I whipped it up and in a matter of hours the pain was gone. I also made it into a salve for our milk cow which combined with peppermint helped us keep her clear from mastitis also. First I chopped an onion and sautéed it in liquid cooking oil, Safflower or Olive Oil. Once transparent, stop cooking. Let sit and cool a minute. While still warm, not hot enough to burn, but warm I wrapped in cheese cloth and placed on breast in bra. I stuck to chest with tape. Within about 30 minutes my pain was gone. I did leave on about two more hours to make sure all goodness was at work and absorbed. I had no more pain, redness, swelling after that. Bam! It was gone. So then I just had to try on our cow.