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Cryotherapy for sunspots. Cryotherapy or liquid nitrogen is the most commonprocedure performed by skin cancer doctors. This time tested treatment can be used to treat a variety of skin cancers including solar keratosis or sunspots, superficial skin cancers such as basal cell carcinomas, and intra-epidermal SCCs.
Cryotherapy refers to a treatment in which surface skin lesions are frozen. Cryogens used to freeze skin lesions include: 1  Liquid nitrogen (the most common method used by doctors). 2  Carbon dioxide snow (more commonly used 20 years ago).