Were you riding the same bike with the same setup without discomfort before? If not, it might be a bike fit problem rather than a saddle problem. I say that because my husband had a very similar one-side saddle sore issue that happened when he got a new bike and put his old favorite saddle on it. It turned out that it was from setting the saddle too far forward.

I did the same thing on my Butterfly, which I had ridden without problems for a couple of years. I loaned my bike to my husband, and when he put my saddle on he got it too far forward, and I had the same problem: a saddle sore just on one side, right in the place you are describing.