The CryoPen delivers a fine, controlled jet of very cold nitrous oxide to the blemish. That freeze breaks down the tissue, the spot darkens and forms a small scab, and over the following one to four weeks it lifts away naturally as the skin heals underneath. Each freeze lasts only a few seconds and the whole visit takes minutes. It is more precise than a traditional liquid nitrogen spray, which freezes a wider halo of healthy skin.
Freezing destroys tissue on contact, so nothing is left to check under a microscope. That is exactly why we only ever freeze something we are already confident is benign. Anything uncertain gets assessed first, by your GP or a dermatologist, never frozen.
For most people it is simply a little redness and a scab that heals cleanly. Some experience temporary blistering. There can be a change in pigment where the spot was, lighter or darker, more likely on deeper skin tones, which we always talk through first. Scarring is rare but possible, especially if a scab is picked before it is ready.
A proper look at the lesion, photos for your file, and a straight answer about whether it should be frozen or seen by a doctor first.
A short stinging or cold-burning sensation for a few seconds, then it is done.
A blister within a day or two is normal. Keep it clean and dry for 24 hours.
Let the scab fall away on its own. No picking, no swimming or saunas until healed. SPF on the area once healed.
Priced per visit. Your first follow-up for the same lesions is included, we book it for you.
Prices from the live KB menu, 26 October 2026. Single sessions are paid in full. Courses can be split over three months. KB members save 10% on most further treatments and on in-clinic skincare.
People love how simple it is. But it only ever happens on something we are certain is harmless. If there is any doubt at all, it gets checked first, never frozen. Safe always beats quick.
Only once we are confident it is benign. Anything uncertain or changing is seen by a doctor first. We never freeze an undiagnosed lesion.
A short, sharp cold, sometimes a slight sting on thaw. Most people manage comfortably without numbing.
Rarely, and usually only if a scab is picked early. A temporary change in pigment is more common, and more likely on deeper skin tones.
Louise or R-Marni, our advanced skin therapists, after assessment.
A skin consultation with an advanced skin therapist, £50, includes a proper look. Anything uncertain is referred before anything is treated.
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