It's just stitches. I just finished the eighth grade and plan to have my stitches removed in a few days, because the hospital and I live in different cities, which is not so convenient. On the end of the day, I went home by bus, and the fright along the way made my nose a little sour. I don't see anything now, so if there is any problem, just do it. Generally, sit-ups and dumbbells are not very strenuous exercises.