What Is Cryotherapy? What Are the Common Uses of Liquid Nitrogen in Dermatology?

“Cryotherapy” may sound chilly, yet it is a well-established technique that dermatologists have used for decades. Its principle is straightforward: liquid nitrogen (-196°C) is sprayed onto or brought into contact with lesions, causing instant freezing and necrosis of the tissue. The body then naturally repairs and sheds the damaged tissue.

## 1. The Underlying Mechanism

When liquid nitrogen touches the skin, ice crystals form inside and outside skin cells, rupturing cell membranes and capillaries and triggering local tissue necrosis. The body then activates its repair response to break down and absorb necrotic tissue, while healthy surrounding tissue grows in to heal the area.

A core feature is **controllable depth**. The spray duration and angle determine which skin layers are affected. This explains its consistent results and relatively low cost.

## 2. Common Applications in Dermatology

① **Common Warts**
This is the classic use of cryotherapy. Warts are benign growths caused by HPV infection that reside in the stratum corneum. Freezing directly damages the epidermal layer and viral structures.

② **Pigmented Nevi (Moles)**
Small, evenly pigmented benign moles can be removed via cryotherapy. However, **not all moles are suitable**. Large moles, unevenly coloured moles, and lesions with blurred borders require a biopsy first to rule out malignancy.

③ **Vascular Lesions**
Port-wine stains, haemangiomas, and cherry angiomas, among others. Cryotherapy works well for superficial telangiectasia, as blood vessels are highly sensitive to cold; freezing induces vessel thrombosis and subsequent absorption.

④ **Solar Lentigines (Seborrheic Keratoses / Age Spots)**
Cryotherapy is a classic treatment for seborrheic keratoses. Curettage combined with freezing delivers better outcomes, though recovery takes slightly longer than laser treatment.

⑤ **Condyloma Acuminata and Plantar Warts**
These are frequent indications for in-clinic cryotherapy.

⑥ **Minor Skin Growths**
Such as skin tags and some hyperkeratotic lesions.

## 3. Treatment Sensation and Recovery Process

**Sensation during treatment**: You will feel sharp stinging and burning during spraying, which usually lasts a few seconds to more than ten seconds. Pain levels vary by location and individual tolerance; fingertips and toes (distal sites) tend to hurt more.

**Post-treatment changes**:

- Redness, swelling and possible blistering within hours (this is a normal reaction)
- Blisters may rupture and ooze within 1–2 days
- The area will then scab, dry out and slough off

**Full recovery generally takes 2–4 weeks**, depending on wound size and location. New epidermis grows once the crust falls off; the fresh skin may look pinker or darker and will fade gradually over time.

## 4. Important Precautions

① **Do not pop blisters by yourself**
Self-popping raises infection risk. Keep the area clean and dry to let blisters resolve naturally. Seek medical help if blisters are tense and severely painful.

② **Strict sun protection after cryotherapy**
Newly regenerated skin is fragile and prone to post-inflammatory hyperpigmentation after sun exposure. Physical sun protection is preferred during recovery.

③ **Location matters**
The face, joints, and earlobes carry higher scarring risk or slower healing and demand extra caution. Cryotherapy is a routine dermatology service, but facial treatment should only be performed by an experienced clinician.

④ **Multiple sessions may be needed**
Larger lesions often cannot be fully cleared in one session and require repeat treatment after several weeks.

⑤ **Caution or contraindications for certain groups**
Cryotherapy should be used cautiously for patients with hypopigmentation, psoriasis, cryoglobulinaemia, Raynaud’s phenomenon, as well as for facial pigmented nevi whose nature has not been confirmed.

## 5. Cryotherapy vs Other Treatment Options

**Advantages of cryotherapy**: Low cost, fast procedure, reliable effects on warts and vascular lesions.
**Limitations of cryotherapy**: Less precise than lasers; depth control relies heavily on practitioner experience and may injure adjacent healthy skin; longer downtime compared with fractional lasers.

Quick comparison with lasers:

- **Cryotherapy**: Better suited for benign raised lesions (warts, seborrheic keratoses, haemangiomas)
- **Lasers**: Better suited for pigmented lesions and skin texture refinement with higher precision

## Final Notes

Cryotherapy has decades of clinical history and is a mature, reliable modality. It is affordable, effective, and has well-defined indications — it is not an outdated treatment.

The key rule remains: **characterise any skin lesion before treatment**. Attempting to remove pigmented moles blindly carries the highest risk.

If you want to know which treatment suits your skin concerns, Romantic Gangnam has compiled plenty of educational content and case studies from Korean dermatologists. Search WeChat ID: **lmjn002**. Identify what the lesion is before deciding how to treat it, so you can avoid unnecessary mistakes.