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Entry 316Filed under Breeding

What Skin Cancer in Cats Can Look Like—and What to Do Next

Skin cancer in cats includes several tumors with different behavior. Persistent or changing sores and lumps need veterinary assessment because appearance alone cannot diagnose them.
3-minute read By Animalso Team
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Skin cancer in cats is an umbrella term for several different skin tumors, not one disease. Some are benign; others can invade nearby tissue or spread. A sore or lump cannot be identified by appearance alone, so a persistent, recurring, ulcerated, or changing lesion should be checked by a veterinarian.

What does “skin cancer” mean in cats?

The term covers tumors that arise in the skin or just beneath it. Examples include mast cell tumors, basal cell tumors, squamous cell carcinoma (SCC), soft tissue sarcomas such as fibrosarcoma, and melanoma. Their behavior varies: mast cell tumors are often benign but can recur or spread; basal cell tumors may be benign or malignant; SCC can invade surrounding tissue; soft tissue sarcomas can be locally invasive and recur; and melanomas in cats may be benign or malignant. Because these conditions can look alike, a lump’s color, size, or location cannot establish what it is. Merck Veterinary Manual describes these tumor types and their behavior.

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A historical biopsy and necropsy series illustrates the range, but should not be read as a current estimate of a cat’s risk: among 3,564 cats examined over 41 months from 1986 to 1989, 340 had cutaneous neoplasia. Four types—basal cell tumor, mast cell tumor, SCC, and fibrosarcoma—accounted for 77% of those diagnosed cases. The population was selected for diagnostic examination, not representative of all cats. Miller et al., Veterinary Pathology (1991).

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What signs should prompt a veterinary visit?

Arrange an examination for a sore, scab, ulcer, or lump that persists, returns, grows, or changes. SCC often affects sun-exposed, lightly pigmented or sparsely haired areas, including ear tips, the nose, eyelids, lips, and temples. A lesion can begin looking small or superficial and later become ulcerated or invasive. Other tumor types can arise elsewhere, so the site alone does not diagnose the cause. Merck Veterinary Manual and Cornell Feline Health Center describe these signs and common SCC locations.

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Changes around the mouth also warrant attention. Possible signs associated with oral SCC include excessive drooling, bad breath, reduced appetite, weight loss, jaw swelling, or loose teeth. Dental disease and other conditions can cause similar signs, so a veterinary examination is needed rather than a home diagnosis. Cornell Feline Health Center.

How do veterinarians determine whether a lesion is cancer?

The veterinarian examines the lesion and may collect cells or a tissue sample for laboratory assessment. Cytology examines cells; histopathology evaluates tissue. These tests can identify the tumor type, which is important because different tumors call for different treatment and have different expected behavior. After removal, histopathology can also assess surgical margins—whether tumor cells reach the cut edge of the removed tissue.

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The American Animal Hospital Association’s 2026 oncology guidelines say cytologic or histopathologic diagnosis is needed to assess prognosis and develop an optimal treatment plan; staging or grading is often needed as well. Depending on the case, the veterinary team may recommend further evaluation to understand the tumor’s extent. AAHA’s guidance puts it plainly: “A suspicion or diagnosis of cancer should be the beginning and not the end of the diagnostic process.”

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What treatments may be considered?

Care depends on the confirmed tumor type, its location and size, how deeply it extends, whether there is evidence of spread, and whether surgery can remove it with clear margins. The veterinary team also weighs effects on comfort and function, treatment burden, and the goals for the individual cat. Options are not interchangeable.

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  • Surgery: A common option; the surgeon may remove surrounding tissue to try to achieve clear margins.
  • Radiation or cryotherapy: May be considered for selected tumors and locations.
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Earlier SCC may be more amenable to local treatment, while advanced invasive disease can be harder to control. The appropriate plan and prognosis require an individual diagnosis and assessment. A veterinary oncologist may help with complex tumors or treatment decisions. AAHA, Merck Veterinary Manual, and Cornell Feline Health Center describe diagnostic and treatment approaches.

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Does sunlight cause skin cancer in cats?

Prolonged ultraviolet exposure is a major cause of cutaneous SCC, especially on lightly pigmented or sparsely haired skin. That risk does not apply to every feline skin tumor: Merck notes that sun damage is seldom associated with melanoma in cats. Avoid assuming that every skin cancer is sun-related. Merck Veterinary Manual; Cornell Feline Health Center.

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To reduce UV exposure, Merck lists UV window screens, sunscreen, and keeping cats indoors during peak sunlight hours (10 a.m. to 2 p.m.). Window screens or film are environmental measures, not treatment for an existing lesion. Ask a veterinarian before applying sunscreen or other products to a cat; no single formulation is established as appropriate for every cat. These steps address UV exposure and SCC risk, not all types of skin cancer. Merck Veterinary Manual.

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