First, why are your pul pants ruined now? If you stain them with blood, then just wash them. They may still be discolored, but they will still work just as good as before.
Second, for bleeding or open sores, talcum powder does help to keep them dry for a little while. You do have to use a generous amount though and it only lasts for a few hours at best. Your best bet it to keep it clean and aired out as much as possible. Use a medicated cream or steroid to help it heal too. Just make sure it's something that will fully absorb into the wound and not create a barrier which will otherwise keep it moist and bleeding.
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