Cryotherapy for Dog Skin Growths: How Freezing Removes Lesions Safely

By Emiel Maddens · Reviewed in consultation with licensed veterinary professionals · Updated August 2026 · 9 min read

What Is Cryotherapy for Dog Skin Growths?

Cryotherapy, also called cryosurgery, is a procedure that destroys a skin growth by freezing it to a temperature low enough to kill the cells within it, allowing the dead tissue to slough off and the wound to heal without a scalpel incision or sutures. In small animal practice the cryogen is almost always liquid nitrogen, which boils at -196°C and can drive tissue temperature well below the lethal threshold within seconds.

Cell death is not simply a matter of cold. Two mechanisms operate together. During rapid freezing, ice crystals form inside and around cells, physically rupturing membranes and organelles, while the rising solute concentration in the unfrozen fraction of water draws fluid out of cells and denatures proteins. During the hours that follow, a second wave of injury occurs as the microcirculation feeding the lesion thromboses, cutting off oxygen delivery and causing delayed ischemic necrosis (tissue death from loss of blood supply). The vascular phase is why a lesion that looks intact immediately after treatment sloughs several days later (Gage and Baust, 1998).

Reliable tissue kill in most tumor types requires reaching -20°C to -50°C at the deepest edge of the lesion, not merely at the surface. Because a spray of liquid nitrogen cools the surface far faster than the base, protocols emphasize freezing until a visible ice ball extends a few millimeters beyond the lesion margin in every direction.

Cryotherapy is a legitimate surgical modality with a defined set of appropriate targets, not a shortcut around diagnosis. Its main advantages are that it can often be performed with sedation and local anesthetic rather than general anesthesia, it produces minimal bleeding, and it is well tolerated by older dogs with anesthetic risk factors. Its main limitation is that the destroyed tissue cannot be sent to a pathologist for margin evaluation.

Which Dog Skin Growths Can Be Frozen Off?

Cryotherapy suits small, superficial, benign, well-demarcated lesions, typically under 1 cm in diameter and no more than a few millimeters deep. Reported cure rates for this category of lesion are high, with published clinical series describing complete resolution in the substantial majority of small benign masses treated in dogs and cats (Queiroz et al., 2008).

Common appropriate targets include cutaneous papillomas and viral warts, skin tags (fibroepithelial polyps), sebaceous adenomas and hyperplastic sebaceous nodules, small eyelid margin masses such as meibomian adenomas, distichiae (aberrant eyelashes), actinic keratoses on sun-damaged skin, and small superficial squamous cell carcinoma in situ lesions on lightly pigmented skin.

Cryotherapy is a poor choice for large or deep masses, for any lesion whose diagnosis is unknown or suspected to be malignant, for mast cell tumors (where degranulation and wide margins are the central concerns), for masses over joints or bone where the freeze zone could injure cartilage or growth plates, and for anything requiring histopathologic margin assessment. The table below sets out the practical comparison against conventional excision.

How Is Cryotherapy Performed on a Dog?

The procedure follows a fixed sequence: diagnose, clip and prepare, protect the surrounding tissue, freeze until an ice ball extends past the lesion margin, allow a full slow thaw, then repeat the freeze. Most treatments take under ten minutes for a single small lesion.

Delivery method is matched to the lesion. An open spray from a fine nozzle suits irregular surface lesions and papillomas. A contact probe, chilled and pressed against the mass, gives more controlled and deeper penetration for nodular lesions and is preferred near the eye. A cotton-tipped applicator dipped in liquid nitrogen is used for very small or delicate sites such as eyelid margins and distichiae. Surrounding normal skin is shielded with petroleum jelly, styrofoam cutouts, or thermal insulating gel to keep the freeze confined.

The double freeze-thaw cycle is central to the technique. Freezing, allowing complete passive thaw, and freezing again substantially increases cell death relative to one freeze, because thawed tissue conducts cold more efficiently on the second pass and because the recrystallization that occurs during slow warming is itself destructive. Freeze fast, thaw slowly, and repeat is the operating principle.

Pain control matters. Freezing destroys nerve endings, so the site is often numb for days afterward, but the freeze itself and the inflammatory phase that follows are uncomfortable. Local anesthetic infiltration before the procedure and a short course of a veterinary nonsteroidal anti-inflammatory afterward are standard. Never give human pain relievers such as ibuprofen, naproxen, or acetaminophen, all of which are toxic to dogs.

Immediately after treatment, expect the site to appear pale and firm, then within 24 to 48 hours to become swollen, red, and sometimes weepy. A scab forms over roughly 3 to 7 days and separates over the following two to three weeks, leaving a small area of granulation tissue that epithelializes and contracts. The site frequently regrows white hair or remains depigmented permanently, because melanocytes are among the most cold-sensitive cells in skin and are killed at temperatures well above those needed to destroy the lesion itself.

Aftercare, Risks, and Complications

The treated site is an open wound for two to four weeks, and most complications trace back to moisture, licking, and secondary microbial overgrowth rather than to the freezing itself. Keeping the area clean, dry, and protected from the dog's own tongue accounts for most of the difference between an uneventful heal and a problem.

Practical aftercare is simple. Use an Elizabethan collar or recovery suit until the scab has fully separated, since a single determined licking session can strip a healing site back to raw tissue. Keep the area dry for the first several days. Do not pick or soften the scab, which acts as a biological dressing. Recheck with your veterinarian if the site is still weeping at two weeks, develops an odor, becomes hot or increasingly swollen after day three, or if the original lesion reappears at the margin.

Recognized complications include overfreezing, where the ice ball extends too deep and damages underlying nerve, cartilage, or bone; incomplete freezing, the most common cause of regrowth, where the deep margin never reached the lethal temperature; postoperative hemorrhage when a slough exposes a vessel; and secondary infection of the moist granulating surface. Depigmentation and leukotrichia (white hair) at the site are expected rather than complications, though owners should be warned about them in advance.

Warm, moist, occluded healing surfaces are hospitable to Malassezia pachydermatis, the commensal yeast that colonizes canine skin and overgrows readily in exactly those conditions, particularly in skin folds, interdigital webs, and the ventral neck. Once the site has fully epithelialized and your veterinarian confirms the wound is closed, a medicated bathing routine helps keep the surrounding skin under control. Yeast Dermatitis Shampoo contains ketoconazole, an azole antifungal that inhibits lanosterol 14-alpha-demethylase and blocks the ergosterol synthesis Malassezia depends on for a functional cell membrane. It is intended for the surrounding skin and coat, not for application to an open or unhealed cryotherapy site.

For background on how yeast overgrowth develops and what it looks like, see our guide to yeast in dog skin folds and the yeast infections in dogs resource.

Cryotherapy Versus Laser, Electrosurgery, and Surgical Removal

Cryotherapy, CO2 laser ablation, electrosurgery, and scalpel excision all remove a skin growth, and the right choice depends on the diagnosis, the size and depth of the lesion, its location, and whether a pathologist needs to evaluate the margins.

Scalpel excision remains the standard for anything with malignant potential, because it is the only method that reliably submits an intact specimen with assessable margins. If a mass could be a mast cell tumor, soft tissue sarcoma, melanoma, or an undiagnosed nodule in an older dog, excision is the correct answer regardless of how convenient a freeze would be.

CO2 laser ablation vaporizes tissue with precise depth control and excellent hemostasis, and it is often chosen for oral lesions, nasal planum lesions, and areas where bleeding is difficult to manage. Like cryotherapy, it destroys the specimen. Electrosurgery is inexpensive and widely available but produces more thermal damage to adjacent tissue, which can slow healing on thin skin.

Cryotherapy's niche is real and worth stating plainly: multiple small benign lesions on an older dog with anesthetic risk. A geriatric Labrador with a dozen sebaceous adenomas and a heart murmur is a far better candidate for a sedated cryotherapy session than for a lengthy general anesthetic and a dozen sutured incisions. It is also useful for lesions in awkward locations such as eyelid margins, and as a debulking adjunct alongside other modalities.

Cost typically favors cryotherapy, since sedation and local anesthesia are substantially cheaper than general anesthesia with monitoring, and there are no sutures to remove. That advantage disappears if the lesion regrows and requires a second procedure, which is the usual outcome when an inadequately frozen deep margin is left behind.

For related reading on evaluating growths before choosing a removal method, see our guides to sebaceous cysts in dogs and canine papilloma virus warts.

Frequently Asked Questions

How much does cryotherapy cost for a dog?

Cryotherapy is usually less expensive than surgical excision because it often avoids general anesthesia. A single small lesion treated under sedation with a local block commonly runs from roughly 100 to 400 US dollars depending on region and clinic, with additional lesions treated in the same session costing less each. Diagnostic sampling before the procedure is billed separately.

Is freezing a skin growth painful for dogs?

The freeze itself is uncomfortable, which is why local anesthetic infiltration and sedation are standard. Afterward the site is often numb for several days because freezing destroys nerve endings, though the inflammatory phase at 24 to 72 hours can be sore. A short course of a veterinary nonsteroidal anti-inflammatory manages this well. Do not give human pain medication.

How long does it take for a growth to fall off after cryotherapy?

A scab typically forms within 3 to 7 days and separates over the following 2 to 3 weeks, with full healing at 2 to 4 weeks for most small lesions. Larger or deeper lesions take longer. Let the scab detach on its own, since it functions as a protective dressing over the granulating tissue underneath.

Will my dog's hair grow back after cryotherapy?

Hair usually regrows, but it is frequently white at the treated site, and the skin often stays permanently depigmented. Melanocytes, the pigment-producing cells, are killed at temperatures well above those needed to destroy the lesion, so pigment loss is an expected outcome rather than a complication. Discuss this with your veterinarian before treating a cosmetically sensitive area such as the face.

Can cryotherapy remove a cancerous lump on a dog?

Only in narrow, specific circumstances such as small superficial squamous cell carcinoma in situ or actinic lesions, and only after a diagnosis has been established. Cryotherapy destroys the tissue, so margins cannot be assessed, and it is not appropriate for mast cell tumors, soft tissue sarcomas, or any mass that could require staged margin evaluation. For those, surgical excision is the standard of care.

Sources

1. Gage AA, Baust J. Mechanisms of tissue injury in cryosurgery. Cryobiology. 1998;37(3):171-186.
2. Queiroz GF, Matera JM, Dagli MLZ. Clinical study of cryosurgery efficacy in the treatment of skin and subcutaneous tumors in dogs and cats. Veterinary Surgery. 2008;37(5):438-443.
3. Withrow SJ. Cryosurgery of tumors. Veterinary Clinics of North America: Small Animal Practice. 1985;15(3):517-528.
4. Holmberg DL. Cryosurgery in small animal practice. Canadian Veterinary Journal. 1982;23(1):18-20.
5. Baust JG, Gage AA. The molecular basis of cryosurgery. BJU International. 2005;95(9):1187-1191.

Related Reading

• Skin Tags and Warts on Dogs: When to Worry
• Sebaceous Cysts in Dogs: When to Remove Skin Lumps
• Fine Needle Aspirate for Dog Skin Lumps: What to Expect and What Results Mean

Emiel Maddens

Founder of Vetified. Develops topical antifungal and antimicrobial formulations for companion animals. Vetified products are listed on DailyMed and manufactured through FDA-registered facilities in the United States.

Veterinary review: All Vetified content is developed in consultation with licensed veterinary professionals and references peer-reviewed research published in journals including Veterinary Dermatology, JAVMA, and Journal of Small Animal Practice.