Cotton swabs can be used for liquid nitrogen cryotherapy of skin. If it is very small, it is best to use a cotton swab. If it is large, you can use cold spraying. Liquid nitrogen freezing is a common physical therapy method in dermatology.
The cotton swab method is the simplest treatment method. Cotton swabs dipped in liquid nitrogen on local skin have a better effect on superficial skin damage, such as superficial verruca vulgaris. Pay attention to prevent liquid nitrogen from accumulating in folds or clothes and causing skin frostbite.