Most of mine are kind of a tan color - and if you do get discharge, just soak in cold h2o when you get home.

I had the burning problem and my doc finally diagnosed an *external* yeast infection. Not vaginal - just on the skin near the lips. Really odd. It had been giving me fits for months. I always shower immediately after riding, dry well, etc. Apparently it was just something my body couldn't quite get rid of alone. A week of an ointment and (knock on wood) problem resolved.

If you still get burning without the extra pad, could be a saddle or shorts problem, but I'd try a cycling specific lube first (e.g. chamois butt'r).

good luck!