When to see a vet urgently
Seek urgent assessment if a skin lesion is accompanied by any of the following:
- Heavy or continuous bleeding from the wound.
- A nasal lesion interfering with breathing.
- Pain preventing eating, or marked lethargy.
- Severe pain around the eye or your cat holding the eye closed.
Even a small non-healing lesion needs examination without waiting for severe symptoms. You can find a vet near you.
Overview
Pale and white cats have less protection against ultraviolet radiation, making their skin susceptible to sunlight's carcinogenic effects. Exposed areas are most vulnerable: ear flaps, the nose tip and eyelids. Early squamous cell carcinoma can look like a small ulcer or scab mistaken for a scratch. However, these lesions do not heal; they gradually enlarge and become ulcerated, invasive tumours.
Squamous cell carcinoma of the skin and the same-named tumour in the mouth are different treatment situations. The oral tumour often behaves much more aggressively. Its prognosis and treatment results therefore cannot be applied directly to a small skin tumour on an ear flap.
Sun-damaged skin may first thicken and become scaly. This change, called actinic keratosis, can occur before actual cancer. Appearance cannot reliably establish how deeply a lesion extends. A scab may also fall off and the skin briefly look better, only for symptoms to return at the same site.
Causes
- Prolonged exposure to ultraviolet sunlight, with sun-induced dermatitis progressing to a tumour.
- Hereditary predisposition associated with pale fur and pink skin.
- Chronic inflammation and non-healing wounds.
- Exposure to carcinogenic substances.
- Age, with older cats more often affected.
Sunlight has a strong association particularly with tumours of pale, sparsely haired skin. However, not every cutaneous squamous cell carcinoma is the same. A separate multicentric superficial form may be associated with papillomavirus, with lesions beyond sun-exposed areas too.
An old wound or skin inflammation does not automatically become cancer. Nor does the list establish the cause of an individual cat's tumour. A claw, ear or other skin lesion is investigated according to its own findings, rather than diagnosing it solely from coat colour.
Risk factors
- White and pale-coated cats with pink ears and noses.
- Cats often in direct sunlight outdoors, on balconies or on windowsills.
- Cats over 7–8 years old.
- Cats with chronic skin inflammation.
Pale, poorly protected skin can also be exposed in a partly dark-coated cat. The whole animal need not be white. Age reflects accumulated exposure and disease likelihood, but does not confirm or exclude the diagnosis alone. Tell your vet where your cat usually rests and how much sun exposure they have had.
Typical symptoms
- Small scabs or ulcers on the ears, nose and eyelids.
- Chronic, non-healing lesions.
- Hardened, thickened skin at the site.
- Hair loss over the tumour.
- Bleeding when the lesion is damaged.
- Pain and itching in later stages.
Watch for an area that crusts, seems to heal, then reddens or bleeds again. A changing appearance is not a reason to leave it unexamined. The lesion may initially be small, without obvious pain or a change in appetite.
Check both ear flaps, the nose and around the eyes. One cat can have several separate lesions, so finding one does not remove the need to check others. Record when it was found and take a clear photograph for comparison. Do not remove the scab or rub the area to see beneath it.
Complications and consequences
- Destruction of ear, nose and eyelid tissue.
- Chronic pain.
- Secondary bacterial infections.
- Local recurrence after removal.
- Metastases to lymph nodes and lungs in later stages.
Local tissue destruction can complicate treatment before metastases develop. A deeper nasal lesion can extend into the nasal cavity, while an ear or eyelid location affects removal options. Relatively infrequent metastasis therefore does not mean the tumour is harmless.
Diagnosis at the vet
- Examination and history, including pale colouring and sun exposure.
- Cytology to look for suspected tumour cells.
- Biopsy and histology to confirm the diagnosis.
- Ultrasound and X-rays to assess extent and metastases.
- Blood tests to assess general health.
Sampling helps distinguish cancer from sun-induced precancerous changes, inflammation and other skin diseases. A cell sample may be inconclusive, making tissue sampling necessary. During histology, a pathologist assesses tissue structure and tumour invasion. The sampling site is chosen to obtain a representative sample of abnormal tissue.
Other skin sites and nearby lymph nodes are also considered. Staging needs depend on location and extent. The lungs may be assessed with X-rays or CT, while more detailed imaging can investigate local growth where needed. Blood tests help assess other health conditions and treatment safety, but do not confirm or exclude skin cancer alone.
Treatment
A small local tumour can often be removed surgically. The aim is to include enough surrounding tissue. The sample's surgical margins are assessed to see whether the tumour reaches the edges of the removed tissue. This affects additional treatment and follow-up planning.
For an ear flap lesion, treatment may involve removal of the affected part of the ear. Nose or eyelid surgery is planned with function and wound closure in mind. Before deciding, discuss the expected benefit, recovery and whether complete removal is possible. A small superficial lesion and a deeply invasive tumour require different plans.
Selected superficial lesions may be treated with cryotherapy, local radiotherapy or photodynamic therapy, in which light activates a substance targeting the tumour. Radiotherapy may also complement surgery. Suitability depends on depth and location; topical or superficial treatment does not automatically work against a deep tumour.
If curative treatment is impossible, pain and ulcer symptoms can still be relieved. Chemotherapy benefits are not clear for every cutaneous squamous cell carcinoma, so its purpose is assessed individually. Symptom-relieving care particularly monitors eating, movement, rest and how the burden of treatment affects your cat.
Home care and monitoring
Follow wound care and medicine instructions. Prevent scratching and rubbing of the area as agreed, because further damage predisposes it to infection. Keep a surgical wound dry and do not add other creams or cleaning products without instructions. Report increasing discharge, swelling or wound opening.
Pain may appear as behaviour changes even without vocalisation. Report reduced jumping, grooming or social contact. If giving medicines is difficult or your cat starts avoiding treatment situations, the plan can be adapted.
Also monitor previously healthy skin. A new scab in the treated area may represent recurrence or another problem needing treatment, rather than automatically being ordinary healing. Continue sun protection after treatment. Follow-up is agreed according to tumour findings and the treatment used.
Prognosis
An early, superficial skin tumour removed completely may have a good prognosis. An extensive or deep lesion can be harder to control even without detected metastases. Location, tissue sample, surgical margins and overall health are considered. A particular survival time cannot be inferred solely from the cancer's name.
Prevention
- Limit direct sun exposure in white and pale cats, including during long, bright summer days.
- Use sun protection products intended for animals where needed.
- Seek veterinary care promptly for non-healing ulcers.
- Check an older cat's skin regularly.
Staying indoors alone does not resolve exposure if your cat spends long periods on a sunny windowsill. Provide shaded resting places and use window shading or UV protection where needed. Adapt outdoor access so your cat does not lie for long in strong, direct sun. Make moving into shade easy.
Choose a sunscreen specifically suitable for cats with your vet. Not every human product is safe, particularly if licked. Avoid sunscreens containing zinc oxide or salicylates, for example. Do not apply a product to the eyes or an ulcerated tumour on your own judgement. Sunscreen does not treat an existing tumour or replace shade.
Marked redness, blisters or pain after sun exposure need assessment even without a cancer diagnosis. Do not wait for a large lump: cutaneous squamous cell carcinoma can also grow as an ulcerated, fairly flat area.
Important for cat owners
Cutaneous squamous cell carcinoma is a dangerous tumour that often looks like a scratch or scab for a long time. Remember that every chronic ear or nose skin lesion, particularly in a white cat, should be biopsied. A tumour removed early may have a good prognosis, but advanced disease destroys tissue and threatens life.
Your vet decides whether and how to biopsy according to findings. However, a persistent or recurrent wound is not a reason for home creams alone; its cause needs investigation.
This article provides general information and does not replace veterinary care. Contact a vet if you notice signs of illness in your cat.
Frequently asked questions
Can a small ear scab be skin cancer?
Yes, but other skin diseases can look similar. A lesion that recurs at the same site or heals poorly in particular is examined and sampled where needed.
Can a dark cat get squamous cell carcinoma?
Yes. Pale and sparsely haired areas are more easily exposed to sun, but coat colour alone does not rule out a tumour. Other forms of cutaneous squamous cell carcinoma also occur.
Is sunscreen enough to treat an existing tumour?
No. Sun protection helps prevent further damage, but a confirmed tumour needs its own treatment plan. Check product safety with your vet.
Is the prognosis the same for skin and oral squamous cell carcinoma?
No. The oral tumour often behaves more aggressively. A skin tumour's prognosis is assessed according to location, extent, tissue sample and treatment options.
This article is for general information only and is not a guide to treatment. If you notice the first signs of illness, contact your vet.
Paw4care editorial team
Sources
- Squamous Cell Cancer: Dangerous, Cornell Feline Health Centre, accessed 2026-11-03.
- Tumours of the Skin in Cats, Merck Veterinary Manual, accessed 2026-11-03.
- 2026 AAHA Oncology Guidelines: Section 1, Overview of Common Cancers, AAHA, accessed 2026-11-03.
- Squamous Cell Carcinomas in Cats, VCA Animal Hospitals, accessed 2026-11-03.
- Cats and Warm Weather, Cats Protection, accessed 2026-11-03.
- Care of Surgical Incisions in Cats, VCA Animal Hospitals, accessed 2026-11-03.
- 2023 AAFP/IAAHPC Feline Hospice and Palliative Care Guidelines, American Association of Feline Practitioners and IAAHPC, accessed 2026-11-03.
- Chronic Pain Assessment in Cats, American Animal Hospital Association, accessed 2026-11-03.
- Sunburn in Pets, PDSA, accessed 2026-11-03.
- Initial Triage and Resuscitation of Small Animal Emergency Patients, Merck Veterinary Manual, accessed 2026-11-03.
