What are the common symptoms of skin squamous cell carcinoma?

Common signs include localised scaling, nodules, or ulcers that repeatedly break open or produce discharge. If changes in energy or appetite also occur, see a vet promptly.

How is squamous cell carcinoma confirmed?

A fine-needle aspirate or skin cytology is typically used as an initial assessment; definitive diagnosis usually requires a tissue biopsy confirmed by pathological examination.

What treatment options are available?

Treatment depends on the lesion's location and stage. Common approaches include surgical excision, localised therapy, or radiation therapy — your vet will evaluate and recommend a treatment plan.

How should follow-up and aftercare be managed after surgery?

Attend scheduled follow-up appointments to check wound healing and monitor for possible recurrence. Continuously photograph and document lesion changes, and follow your vet's schedule for revisits and imaging.

How much do the tests and treatment usually cost?

Costs vary by clinic and region — ask your vet for an estimate before proceeding.

Disease Guide

Squamous Cell Carcinoma of the Skin in Dogs & Cats: Ulcers, Diagnosis & Care Guide [2025]

A malignant skin tumour — early surgical treatment carries a better prognosis

Take 1 minute to check the symptoms first

Last updated: 2026/01/06

Pethealthmap Editorial Team

Sources: AVMA, ISFM, National Taiwan University College of Veterinary Medicine

When to See a Vet

Seek emergency care immediately

•The lesion is bleeding heavily and cannot be stopped
•Sudden and severe decline in energy with inability to move normally
•Gums or eye conjunctiva appear noticeably pale

Schedule a clinic visit soon (within 24–72 hours)

•A new hard lump has been found and has not resolved after several weeks
•The lesion repeatedly breaks open or has abnormal discharge
•Persistent licking or biting of the same spot with no improvement

01What symptoms indicate something is wrong?

Skin squamous cell carcinoma typically presents as a localised skin lesion, but may also affect your pet's overall energy and appetite. Early changes may be subtle, but persistent changes or recurring ulcers warrant attention.

Localised scaling, crusting, or a visible raised nodule on the skin
The lesion repeatedly breaks open, ulcerates, or produces discharge
Your pet frequently scratches or continuously licks and chews the same spot
Colour changes or surface ulceration in the affected area of skin
Decreased energy, reduced appetite, or lower activity levels
A new lump or a long-standing non-healing ulcer should prompt a vet visit

Seek emergency care immediately if you notice the following symptoms:

⚠️ Seek immediate veterinary care if there is heavy or uncontrollable bleeding
⚠️ Take note if your pet appears markedly lethargic or stops eating

02How can I tell if something is wrong? Home monitoring and emergency criteria

Continuously documenting the lesion and your pet's overall condition at home helps the veterinarian assess the disease course and plan the necessary investigations.

Observe your pet's energy, activity levels, and appetite daily
Track any changes in water intake and toileting habits
Weigh your pet regularly and record the trend over time
Take close-up and full-body photos of the lesion with your phone for reference
Note when you first noticed the lesion and how quickly it has changed
Keep photos and records to bring to the clinic for your vet's review

03How will the veterinarian diagnose this? Common diagnostic tests

The vet will start with a skin examination, combined with cytology, biopsy, and imaging to assess local invasion or spread, as well as evaluate the overall surgical or treatment risk.

Physical examination

palpation of the skin lesion and nearby lymph nodes

Fine-needle aspirate / cytology

preliminary assessment of cell morphology

Tissue biopsy

confirms the pathological diagnosis

X-ray

evaluates possible signs of distant metastasis

Advanced imaging (CT or MRI)

staging and surgical planning

Blood tests

assess overall health and anaesthesia risk

It is recommended to book at a specialist clinic that can perform biopsies and advanced imaging

04What treatment and care are needed after diagnosis? Medication, diet, and care guide

Treatment is determined by the diagnostic findings. Regular follow-up of wound healing and overall health is required after surgery or localised therapy, alongside attentive home care and photographic documentation.

Attend regular follow-up appointments to check wound healing after surgery
Medication or topical treatment requires scheduled follow-up as directed by your vet
If undergoing radiation or localised treatment, attend all scheduled check-ups
Maintain good nutrition and a stable body weight to aid recovery
Continue taking photos to document and compare lesion changes over time
For complex or recurrent cases, consider a referral or specialist consultation

05What should I prepare before the vet visit? Key information to help your vet quickly assess the problem

Take close-up and wider-angle photos of the lesion with your phone and save them

Record when you first noticed the lesion and how quickly it has changed

Note the frequency and characteristics of scratching, bleeding, or discharge

List any recent changes to diet, environment, or medications

Bring previous test reports, imaging results, and a current medication list

It is advisable to call ahead and book a clinic that can perform biopsies or imaging

This content is for reference only and cannot replace a professional veterinary diagnosis. If your pet shows signs of illness, please seek veterinary care promptly.

Related Symptoms (You May Also Be Looking For)

Lethargy

Decreased activity

Anorexia

Loss of appetite

Crusting

Crust formation