It didn't make things worse, at least
I was using this in tandem with an antifungal cream prescribed by my doctor.  However, the antifungal was causing the distressing side effect of intense itching.  I stopped its use and only used this soap.  The Tinea Versicolor seems to have cleared up, but I don't know if it was from the antifungal or from this soap.  I plan to continue to use this soap in hopes of preventing more TV in the future.  (I have been using it for 4 weeks past the antifungal and the TV has not come back yet.)  Some users complained of a strong sulfur smell and I think the smell goes away after you rinse it off.
Rating: 4 stars