Try not to think too hard about it.
I happen to be one of those lucky few who have never needed medical sutures in me. I’ve never needed stitches or had invasive surgery, and with any luck, things’ll stay that way for the rest of my life. However, being a conscientious person, I’ve taken it upon myself to learn a few handy first aid skills. While I endeavor to never be in a situation where I need thread in my skin, I do know how to secure one if necessary. The cornerstone of such a procedure is a surgical knot.
You might be thinking, “well, I know how to tie my shoes, how hard could it be to tie a knot in a person?” First of all, how often do you have to re-tie your shoes? Because that can’t be a factor with something holding someone’s skin together. Secondly, compared to shoelaces, surgical sutures are much smaller and finer, which means you need to be twice as precise with your work or the knot’s going to come out lopsided and inefficient which, again, would be a huge problem.
Injuries that require stitches can’t be healed with some spit and a bandage. If you receive such an injury, it’s imperative you find someone who can sew it up as quickly as possible. Preferably a doctor.