Cryosurgery for Plantar Warts

Pre-Treatment Preparation

Debride the plantar wart using a surgical blade to remove hyperkeratotic tissue and improve treatment penetration, as recommended by the British Association of Dermatologists 1, 2
Ensure the treatment area is clean and dry before cryotherapy application, as suggested by the Centers for Disease Control and Prevention 3
Consider topical or injected local anesthesia if treating multiple warts or large surface areas, as plantar warts can be particularly painful during treatment, according to the Centers for Disease Control and Prevention 4, 5

Apply liquid nitrogen directly to the wart using either a cryogun spray or cryoprobe, as recommended by the Centers for Disease Control and Prevention 4, 5, 2
Proper training is essential—both over-treatment and under-treatment reduce efficacy and increase complications, as noted by the Centers for Disease Control and Prevention 4, 5, 2
The mechanism of action is thermal-induced cytolysis that destroys wart tissue, as explained by the Centers for Disease Control and Prevention 4, 5, 2

Repeat cryotherapy applications every 1-2 weeks for optimal results, as recommended by the Centers for Disease Control and Prevention 4, 5, 2, 3
The British Association of Dermatologists recommends gentle fortnightly treatments for 3-4 months 1
If no substantial improvement occurs after 3 treatments, or if warts haven't completely cleared after 6 treatments, switch to an alternative modality, as suggested by the American Academy of Dermatology 2

Patients should expect pain after liquid nitrogen application, followed by necrosis and sometimes blistering—these are normal responses to treatment, as noted by the Centers for Disease Control and Prevention 4, 5, 2
Warn patients about potential scarring, particularly persistent hypopigmentation or hyperpigmentation, which is common with ablative modalities, as warned by the American Academy of Dermatology 2, 3
Recurrence rates range from 16-22%, with most recurrences occurring within the first 3 months after treatment, as reported by the American Academy of Dermatology 2, 3

Do not use cryotherapy as monotherapy for plantar warts without adequate debridement—this significantly reduces treatment efficacy, as warned by the British Association of Dermatologists 1, 2
Avoid excessive treatment depth that extends into the dermis, as this increases scarring risk and can cause nerve damage in areas with superficial nerves, as cautioned by the American Academy of Dermatology 3
Be cautious in patients with diabetes, peripheral vascular disease, or poor circulation to extremities, as they may have delayed healing, as advised by the American Academy of Dermatology 3
Cryotherapy is contraindicated in patients with cold intolerance disorders (Raynaud's disease, cryoglobulinemia, cold urticaria), as contraindicated by the American Academy of Dermatology 3

Instruct patients to keep the area clean and dry, allow scabs to fall off naturally (typically 1-2 weeks), and return for follow-up in 2-4 weeks, as recommended by the American Academy of Dermatology 3
Patients should contact you if signs of infection develop (increasing pain, warmth, redness, swelling, discharge), as advised by the American Academy of Dermatology 3

Document the dose, duration, number of freeze-thaw cycles, and obtain verbal consent for each cryotherapy session, as required by the British Association of Dermatologists 1, 3
Provide patients with a written information leaflet about cryotherapy, as recommended by the British Association of Dermatologists 1, 3