According to mothernature.com, you can use castor oil to calm the pain.

Calm the pain with castor oil. The acutely painful stage of bursitis will usually recede in four or five days, but it can last longer. When the pain is no longer acute, therapy must be changed. At this point, heat replaces cold and exercise replaces immobilization.
Dr. Tomson recommends a castor oil pack, which is as simple to make as it is effective. Spread castor oil over the afflicted joint. Put cotton or wool flannel over that, then apply a heating pad. That’s all.

I hope that answers your question.