Ultracycling

I'm not as much of an expert in gooch warfare as Hippy, but one thing that's worth considering is that trying to find the right chamois cream really helps too. It's a bit like finding the right facewash or whatever, as much as they're all seemingly the same the wrong one can cause spots.
Any of the lanolin-based ones need washing off really well too, as they can clog pores pretty easily and the lanolin is basically waterproof.