Uh... Freeze your skin? I think you mean alcoholic patches. They use it to clean your skin before the process.
to prevent infection
Before an injection, doctors and nurses wipe the skin with 70% alcohol in the form of patches.
How fast does skin freeze in -22C?
it takes skin exactly 1 hour to freeze in - 20 degrees
go to the doctors just in case. you may need a tetanus shot.
-1 Degrees
You could but it would make it difficult to skin
you would have to peel the skin off if that helps
Skin craft
Well ... you're sticking a needle into your skin. Of course it hurts, but it's not bad because first they give you a shot that numbs the area so you don't feel it after the shot.
Sure, if you want to freeze your skin off as well!
If the skin is even slightly moist, it can freeze to the ice if the ice is much below the freezing point - just like your tongue can freeze to metal if you are foolish enough to lick it in the winter.