How do you prevent razor bumps?
All you need to do is not to shave on dry skin. Always shave when you are in the shower or you have just come out the shower when your legs are wet.
They can if you overshave - for example if you were to shave and get razor bumps, then run the razor over the area again it could catch the tops of the razor bumps cutting them, thus causing the bleeding. It's very common when shaving your pubic region too as the coarse hair pushes the skin around the hair shaft up a little bit, so it's likely to get caught when shaving.