Well my skin grow back if I cut my thumb with a knife
Yes. Put some Bacitracin or Neosporin on it, if you aren't allergic to these. Put a bandaid or bandage on it to keep out dust and dirt. It should take about 2 to 3 weeks to heal. Good luck.
scar tissue will grow back
yes of course
Obviously if it's just a cut. It might be scar-tissue though it's still skin.
yea it will, just like hair grows back if you cut it. but i suggest you dont cut your thumb with a knife
Yes, but why would you want to cut your thumb with a knife first of all?
obviously yes iff its just a cut
I've done that, it's just like any other cut