Not to say the above isn't good advice, I'm sure it is.
I would simply change to paper towel substrate, and keep the envrionment very clean. If its a small wound it will probably heal on its own just fine, and depending on the temperment of the snake you may upset it (and risk opening the closed over wound) by attempting to clean the wound.
I'd say its a judgment call. Have you determined why your snake started to bleed in the first place? Did a piece of decoration perhaps fall on the tip of the tail, or has there been a recent shed? As important as making sure of a full recovery, is making sure it doesn't happen again.