To shoot nosebleeds, they would need to have fake blood every time. The fake blood’s consistency should be similar to how real blood looks like. There are some who use chocolate syrup mixed in with other ingredients to get the proper color. The blood can be placed in and around the nose.
This can occur every time the nosebleed is needed for the scene. There are times when people would use fake dry blood. Some people are fascinated with the nosebleeds that the character Eleven gets because of his power so it is only natural that they would like to know more about how it is done.