system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: When we Sew Our Skin Back Together Why Does the Body go Along With it?

So, I've been wondering this recently because of super hero shows I've been watching. 

We've all seen in movies or tv shows where the badass superhero gets injured or cut and sews his own skin back with a needle and thread. 

My question is why do the skin cells accept the thread from the sewing and more or less have the new skin grow back just as it was? I was just wondering because our bodies can be so un-receptive to  various types of new material that we introduce to it.

Heck, in the colonial times the Indians were almost wiped out just because Caucasians decided to pay them a visit from Europe. But yet we can literally take a needle and sew our skin back in place...
why?
gpt
When you stitch a wound shut, most of the cells are still alive. The stitching just holds them in place while the cells heal the wound. Without stitches, the wound may still heal, but it would take longer and be more prone to infection as well as leave a much larger scar.

Also, the stitching thread itself is not "accepted" by the body. Stitches have to be removed once enough of the skin has healed that it holds in place without them.