Hi,
my friend is putting an icepack on his delto untill it's frozen before he is injecting, he says that he doesn't feel the neddle and that the pain came latter and lower.
I know that the icepack will unvascular (I know the word in french only but something that slow the blood and that do vasoconstriction) your muscle but is it still changing something, is it bad?
Sorry if sentences are hard to read.