Had the same thing a couple of times. Try using a dandruff shampoo like Tegrin down there when you shower. Always do that, anyway. Leave it on while you complete the shower. I think that helped mine heal faster.

Also, it's probably a saddle issue - a pressure issue, like you say. I went to the doc with one and she declined to do anything about it. Said it would heal faster if left alone. Different saddle, and I don't get them anymore. I need a saddle that only my sitbones touch.