Sqad, many, many years ago I had a summer job as an orderly in a local hospital, and in the ward prep-room there was a canister containing a mixture of mustard-seeds and other ingredients. We used to make a paste using that mixture and hot water and then spread in on a towel and fold the towel in such a fashion that the stuff didn't leak out. It was then applied to the affected area of the patient, but you had to check on it every so often to make sure that the skin wasn't blistering...I realize that it sounds really weird now writing about it:)