Im asking for my fianc. he delivers liquid nitrogen. a few days ago he accidentally had some go inside his boot. he had a huge blister that appeared ?

Frost bite: Liquid nitrogen being very cold will cause instant frost bite on contact with skin. It would be prudent to see a doctor to check that deeper tissues are not affected. In the meantime, he should apply an antibiotic ointment, like neosporin, to prevent infection. He should have reported the accident in case he incurs any disability from the accident.