It could be that the saddle seat simply never fit you. I had this happen to me with a black saddle over the summer. I would get bruises on my butt and my butt would swell up in the bruised places like welts. It hurt so bad. I sold it to a woman who felt the saddle was very comfortable and bought a 50lb roping saddle. The other saddle was a black trail\pleasure saddle. I had to have been the seat fit.
It could be the way you sit or the way the saddle makes makes you sit as well as the seat make.
Another thing comes to mind is perhaps you weren't using a properly sized saddle for your butt. Too small of a seat or two large of a seat can cause pressure points on your butt because your butt isn't where it needs to be for a proper fit
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