prokrvariti

1. to start bleeding
   Posle udarca mu je prokrvario nos. — His nose started bleeding after the blow.
   Rana je ponovo prokrvarila kad je skinuo zavoj. — The wound started bleeding again when he took off the bandage.

The subject can be the body part or wound (prokrvario mu je nos) or the person (pacijentkinja je prokrvarila).