On the contrary ... it is fine for liquid nitrogen to contact the skin due to its very low specific heat. You don't want it 'ponding' on any part of your body or that will be trouble. Otherwise, it makes for a 'cool' show.
A cheap version of the cryogenics therapy that Olsen is doing ... is a frigid immersion pool. However, that's the common man 's therapy where cost actually matters.
Just saying ...
Right, but for the average person that's not common knowledge. Best to just avoid it.