While you're waiting for it to heal, think about your preparation. I wouldn't mind betting that you rushed it to get to the "good stuff". Make sure you're using something better than "suds-in-a-can" and take your time getting you skin lubricated, even if you have to apply lather, let it soak in then wash it off and apply fresh stuff when you're about the shave. No matter if you're using a straight or a cartridge, poor preparation can turn a decent shave into a blood bath.