I know this is old but saw the thread and wanted to reply. After giving birth to my daughter, I had a similar reaction to the soap. I talked to my doctor and pharmacist and it turned out to be an allergic reaction to Ammonium Lauryl Sulfate which my pharmacist says is the stuff in the soap to make it slick. I am already allergic to sulfa drugs and sulfites which are generally found in wine and various foods so being allergic to a sulfate did not surprise me. The ingrediant or a variant of it is found in most liquid soaps including shampoos and some conditioners. This was something that was transitional in that I never had a problem using it before. My pharmacist told me that many allergies are cyclic in that they get worse or get better on some cycle (like 6 or 7 years) or when triggered by a change in the body. In my case we figure it was the pregnancy that awakened it somehow.