Quoted: A pre-med student once told me a blood vessel or two run past the upper lip.
A previous reply suggested using a match, but cramming a wad of paper towel in your upper lip as snug as you can will pinch off that flow of blood.
Further, relax.
Getting all stressed out will raise your blood pressure and make matters worse.
Lean over a trash can, and let it drip. Pinching off your nose simply to prevent the blood from dripping is dumb. The "pinch your nose" idea was supposed to actually pinch your nose hard enough to apply enough pressure to stop the bleeding. Most people just pinch the nostrils closed and the blood pools up. Dumb.
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The pinching thing works IF you are bleeding because of a cut or scratch inside the nose, because it puts direct pressure on the actual site of the bleeding. However, you're correct in that it does not work if you are bleeding for reasons other than a cut/scratch.
Things like caffeine and aspirin will increase the severity of nosebleeds, and I can attest that increases in blood pressure will worsen things as well.
I don't know about the thing with arteries and stuff in the upper lip, but I suppose it makes sense. If it works and doesn't cause harm or carry a risk of harm, give it a try