When I apply suction to a certain part of my gums next to a certain tooth, an excessive amount of blood comes out. The blood isn't a constant flow, only when I apply suction.

I don't know what you mean by applying suction. How do you do this? Bloody gums is a sign of gum disease.

This is a sign of something wrong with gum and /or tooth, these isues can cause many other health problems. You need to see your dentist soon