Warts Removal liquid nitrogen Blister

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Facts about skin from the New Zealand Dermatological Society Incorporated. Topic index: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Cryotherapy refers to a treatment in which surface skin lesions are frozen.

Cryogens used to freeze skin lesions include:

  • Liquid nitrogen (the most common method used by doctors)
  • Carbon dioxide snow (more commonly used 20 years ago)
  • Dimethyl ether and propane or DMEP (available over the counter as Wartner®)

Skin lesions treated with cryotherapy

Lesions that may treated by cryotherapy include:

Specialist dermatologists sometimes freeze small skin cancers such as superficial basal cell and in situ squamous cell carcinomas (Bowen's disease), but this is not always successful so careful follow-up is necessary.

Freezing may be the most suitable way of getting rid of many different kinds of surface skin lesion. It is relatively inexpensive, safe, and reliable. However, it is important that the skin lesion has been properly diagnosed. It should not be used to treat melanoma or any undiagnosed pigmented lesion that could be melanoma.

The treatment

Liquid nitrogen
Cryotherapy using liquid nitrogen (temperature –196C) involves the use of a cryospray, cryoprobe or a cotton-tipped applicator. The nitrogen is applied to the skin lesion for a few seconds, depending on the desired diameter and depth of freeze. The treatment is repeated in some cases, once thawing has completed. This is known as a ‘double freeze-thaw’ and is usually reserved for skin cancers or resistant viral warts.

Carbon dioxide snow
Carbon dioxide cryotherapy involves making a cylinder of frozen carbon dioxide snow (–78.5C) or a slush combined with acetone. It is applied directly to the skin lesion.

DMEP
DMEP works at a temperature of –57C. It comes in an aerosol can available over the counter. It is used to treat warts using a foam applicator pushed onto the skin lesion for between 10 and 40 seconds, depending on its size and site.

Cryotherapy stings and may be painful, at the time and for a variable period afterwards. There may be immediate swelling and redness. This may be reduced by applying a topical steroid on a single occasion straight after freezing. Aspirin orally may also reduce the inflammation and discomfort.

Looking after the treatment area

The treated area is likely to blister within a few hours. Sometimes the blister is clear and sometimes it is red or purple because of bleeding (this is harmless). Treatment near the eye may result in a puffy eyelid, especially the following morning, but the swelling settles within a few days. Within a few days a scab forms and the blister gradually dries up.

2003-05-07 08:56:05 by cucuron

Plantar Warts

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