Is that what it does! How neat! I never knew why my grandmother always made us squeeze cuts but heck I learned long ago that these older ladies had a whole lot of practical "old wives" cures for most things and they always seemed to work. :) I also always figured that the fresh blood welling up would push any little nasties and dirt back out with it...whatever the reason I've rarely had a cut go nasty in our house.
Another little trick of hers. For anything that did fester a bit...a very hot steeped tea bag applied a few times a day. Amazing how that heat acting as an old fashioned poltice and the natural tannic acid in tea just draws all the bad out and bingo...you've a nice clean healing area.