Cryotherapy with Liquid Nitrogen for Molluscum Contagiosum

Mechanism and Efficacy

Cryotherapy works by causing thermal damage to infected tissue, allowing the host immune response to eliminate residual virus 1
When treating with cryotherapy, it's essential to identify and address all lesions, including nascent ones, to reduce the risk of recurrence 1

Cryotherapy should be applied directly to the molluscum lesions, which typically present as skin-colored, whitish, or pink papules with a shiny surface and central umbilication 2
For genital lesions, cryotherapy with liquid nitrogen is specifically mentioned as an appropriate treatment option in guidelines from the Centers for Disease Control and Prevention 3, 4

Caution should be exercised when using cryotherapy on certain anatomical sites, such as the vagina, due to the risk of vaginal perforation and fistula formation 3
Cryotherapy should be avoided on the nose due to potential complications including scarring, tissue damage, and adverse cosmetic outcomes 5

Common side effects of cryotherapy include erythema, swelling, vesicle formation, and burning pain 5
Both hypo- and hyperpigmentation can result from cryotherapy, with pigmentary changes typically worse and more persistent in patients with darkly pigmented skin 5

After treatment, patients should be monitored for recurrences, which occur most frequently during the first 3 months, as recommended by the Centers for Disease Control and Prevention 3
Patients concerned about recurrences should be offered a follow-up evaluation 3 months after treatment, as recommended by the Centers for Disease Control and Prevention 3
For patients with associated conjunctivitis, follow-up may be needed until the conjunctivitis resolves, which can take weeks after elimination of the lesion 1