After suffering from the pimple type of saddle sores I decided that I would get the advice of someone who knows. I went to a dermatologist. They gave me some anti-bacterial lotion (clindamycin). The doc also said to take a bath once a week and add half a cup of white vinegar. That vinegar trick has been the most helpful to me, but it's definitely preventative. I need to do it before I get sores and before I'm going to ride a lot (I had to take December off this past year and didn't have a trainer).