If you are bleeding, it means you cut yourself. I realize you don’t consider these small bleeds to be cuts, but that is exactly what they are. But what is the cause? One reason could be your technique. You could be pressing too hard instead of allowing the weight of the razor to do its thing. Also, it could be the blades you are using. If they aren’t sharp enough you can tend to get these micro nicks. Or if they are too sharp combined with poor technique, voila! Blood. Also, it could be your razor. If your razor has issues or it is a low quality brand, you’ll see blood. Also, if your lather isn’t slick enough to provide satisfactory lubrication, blood. Bottom line, stopping the bleeding is within your control. You need to experiment by trial and error until you eliminate the bloodletting.