no, it will not "open up" and the stitches will not break, and it will not cause any long term problems, however, it may or may not weep a little blood under the strain. do not take aspirin unless your doctor tells you to because it thins the blood and prevents it from coagulating. if it doesn't coagulate, healing/knitting time of the cut will be greatly extended. if you want some type of pain pills you can take ibuprofin and you can double the dose on the bottle if necessary "with a doctors approval", so said one of the sports doctors some of us at kawasaki motors used including some of the factory riders.