Liquid Nitrogen is also called Liquid Ice, Cryotherapy, Freezing Treatment for skin cancer. It is freezing ice, sprayed on to a mole being treated. It burns the spot. The skin can blister and becomes a sore. This heals by producing a white scar.
Early basal cell cancers, early squamous cell cancers, and hard Actinic Keratosis ( sun spots) can be effectively treated by this method. Warts can also be treated with this method.
Just after application of Liquid Ice. It has frozen the mole. This will go red in a few minutes and then possibly blister and healed in about 2 weeks. Sometimes it leaves a light coloured scar.