An outpatient medical skin treatment in which warts, skin tags, and certain premalignant lesions are frozen and destroyed using liquid nitrogen.
Indication
- Viral warts (verruca vulgaris, plantar wart, condyloma acuminatum)
- Benign skin growths such as seborrheic keratosis and skin tags (acrochordon)
- Actinic keratosis (sun-related premalignant lesions)
- Superficial basal cell carcinoma (as an alternative treatment in suitable cases)
- Molluscum contagiosum lesions
- Lentigo (age spots) — when there is medical justification, at the physician's discretion
- Adjunctive treatment of keloids and hypertrophic scars
Preparation
- There must be no active infection or open wound at the treatment site
- A history of cold allergy (cryoglobulinemia, cold urticaria) should be reported to the physician
- The procedure is planned carefully in patients with Raynaud's syndrome
- The patient is informed about expectations and the possibility of scarring or color changes
- Some medications (immunosuppressants) may affect healing and should be listed for the physician
How it's performed
- The lesion to be treated and the surrounding area are examined and marked
- Liquid nitrogen (-196°C) is applied to the lesion using a spray or cotton-tipped applicator
- Depending on lesion size, a freezing time of 5-30 seconds is applied
- Two freeze-thaw cycles are usually performed to enhance the effect
- A burning or stinging sensation may occur during treatment; local anesthesia is generally not needed
- After treatment, the area is left open or a light dressing is recommended
Post-procedure
- Redness, swelling, and blistering may develop within 24-48 hours after the procedure
- Blisters dry on their own; do not pop them or forcibly remove crusts
- Full healing takes 1-3 weeks depending on lesion size
- For resistant warts, the procedure is repeated at 2-4 week intervals (typically 3-6 sessions)
- After healing, sun protection (at least SPF 50+ for at least 3 months) helps reduce color differences
Risks
- Temporary pain, redness, swelling, and blistering are expected and normal
- Permanent hypopigmentation (lightening) after healing — particularly in darker-skinned individuals
- Possible hyperpigmentation (darkening) and minor scarring
- Temporary numbness or nerve sensitivity when applied over joints
- Temporary irregularity in nail growth when applied near nails
- Delayed healing and increased infection risk in immunosuppressed patients
FAQ
Is one cryotherapy session usually enough?
It depends on the lesion type. Small skin tags may resolve in a single session, while resistant warts may require 3-6 sessions at 2-4 week intervals. The physician determines the number of sessions during the procedure.
Is the procedure painful?
A mild to moderate burning or stinging sensation is reported. Local anesthesia is usually not needed. In children or sensitive areas, an anesthetic cream may be applied beforehand.
Will scarring remain after treatment?
Permanent scarring is not expected in most cases. Temporary lightening of the skin may occur in darker-skinned individuals. With proper application and care, scarring risk is low; however, it may vary by area and healing pattern.
How do I care for the area after cryotherapy?
Wash the area with mild water; apply antiseptic cream if recommended. Do not pop blisters. Allow crusts to fall off naturally. Sun protection for at least 3 months is important.
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