The liquid nitrogen or LN 2 In addition, it is used in dermatological treatments in therapies known as cryotherapy. The term comes from the Greek word "kryo", meaning "cold", so cryotherapy refers to a cold medical treatment, and belongs to the so-called thermotherapies, which have been used by people since antiquity. Dermatologists have applied such therapies since before 1900.
Cryotherapy is a relatively easy procedure to learn and to apply and is characterized by an extremely low complication rate. Generally very good cosmetic and functional results are also obtained. However, as with all other invasive treatment methods, a good knowledge of their function and methodical management, as well as an accurate indication, is a prerequisite for good results.