Eosinophilic Granuloma Complex in Cats: Signs, Causes and Treatment

Eosinophilic Granuloma Complex in Cats: Signs, Causes and Treatment

By Dr Duncan Houston

A swollen lip, raw patch on the abdomen or strange raised line on your cat’s leg can look frightening. These lesions may resemble an infected wound, burn or tumour, even when the cat otherwise seems completely well.

One possibility is eosinophilic granuloma complex, commonly shortened to EGC. Despite the name, this is not one specific disease. It is a group of three inflammatory reaction patterns that commonly develop when a cat’s immune system responds to fleas, food, environmental allergens or other triggers.

Most affected cats can be treated successfully. The important part is identifying what is driving the reaction rather than repeatedly suppressing the visible lesion and waiting for it to return.

Quick Answer

Eosinophilic granuloma complex is a group of inflammatory skin and mouth lesions in cats. The three recognised forms are the indolent ulcer, eosinophilic plaque and eosinophilic granuloma. Allergies, particularly flea bite hypersensitivity, are common underlying triggers, but infection, parasites and cancerous lookalikes may need to be ruled out. A new lesion should be examined by a veterinarian, particularly if it is painful, rapidly growing, infected or interfering with eating.

What Is Eosinophilic Granuloma Complex?

Eosinophilic granuloma complex describes three recognisable feline skin reaction patterns:

1. Indolent ulcer, also called an eosinophilic ulcer

2. Eosinophilic plaque

3. Eosinophilic granuloma, including linear and focal granulomas

A cat may develop one form on its own or two or three forms at the same time. The word “complex” reflects the way these different-looking lesions have traditionally been grouped together.

The terminology is slightly confusing because only the eosinophilic granuloma is a true granuloma when examined under a microscope. The other forms are inflammatory reaction patterns involving varying combinations of eosinophils, neutrophils, tissue damage and secondary infection.

What Are Eosinophils?

Eosinophils are a type of white blood cell involved in immune responses, particularly those associated with parasites and allergic inflammation.

When eosinophils accumulate within the skin or mouth, they release inflammatory substances that contribute to swelling, itching, ulceration and local tissue damage. This does not mean the immune system is attacking the cat for no reason. It usually means something has triggered an inappropriate or exaggerated inflammatory response.

The visible lesion is therefore a reaction pattern, not necessarily the final diagnosis. The next question is what caused the eosinophils to gather there in the first place.

What Does Eosinophilic Granuloma Complex Look Like?

Form	Typical appearance	Common locations	Usually itchy?
Indolent ulcer	Clearly defined erosion or ulcer with raised edges	Upper lip, usually beside the central groove of the nose	Often not obviously itchy or painful
Eosinophilic plaque	Raised, red, moist, raw or oozing patch	Abdomen, groin, inner thighs, neck or other reachable areas	Usually intensely itchy
Eosinophilic granuloma	Firm yellow-pink nodule, swelling or raised linear lesion	Back of the thighs, chin, lips, mouth, ears or paw pads	Variable

These appearances provide useful clues, but they are not enough to confirm every case. Ringworm, mites, bacterial infections, autoimmune disease and cancer can occasionally produce similar lesions.

1. Indolent Ulcer

An indolent ulcer is usually found on the upper lip. It may affect one side or both sides and commonly appears as:

• A shallow crater or erosion

• A thickened or swollen lip margin

• A red, brown or yellow surface

• A sharply defined lesion with raised edges

• Loss of normal hair along the lip

• Mild crusting or discharge

Despite its dramatic appearance, an indolent ulcer may cause surprisingly little itching or pain. Some cats continue eating and behaving normally, which can make the lesion easy to ignore.

The older name rodent ulcer is misleading. The lesion is not caused by rodents, rodent bites or contact with mice.

Indolent ulcers are commonly associated with allergic skin disease, particularly flea bite hypersensitivity. Food reactions, environmental allergies and local inflammation or trauma may also contribute.

When is a lip ulcer more concerning?

A lip lesion deserves closer investigation when it:

• Appears suddenly and progresses rapidly

• Is deeply destructive

• Affects only one side and looks unusual

• Continues enlarging despite appropriate treatment

• Bleeds repeatedly

• Extends into the mouth

• Develops in an older cat

• Is accompanied by weight loss or difficulty eating

A biopsy may be needed in these situations to distinguish EGC from oral squamous cell carcinoma, lymphoma, mast cell disease or another serious condition.

2. Eosinophilic Plaque

An eosinophilic plaque is usually a raised, clearly defined area of intensely inflamed skin.

It may look:

• Bright pink or red

• Moist or sticky

• Raw and hairless

• Thickened and raised

• Yellow-crusted

• Ulcerated

• Wet enough to mat the surrounding fur

Plaques frequently develop on the abdomen, groin, inner thighs or other areas the cat can easily lick. They are usually extremely itchy, and repeated licking can rapidly enlarge the lesion.

Eosinophilic plaques commonly occur with flea allergy, food-related skin disease or feline atopic skin syndrome. Secondary bacterial infection is also common and may add pain, discharge, odour and further inflammation.

What matters clinically is whether the lesion is merely inflamed or has also become infected. An antibiotic should not be prescribed automatically just because the skin looks angry. Cytology and, where indicated, bacterial culture help determine whether antimicrobial treatment is actually needed.

3. Eosinophilic Granuloma

Eosinophilic granulomas are firmer and often sit deeper within the skin than plaques.

They may appear as:

• A raised linear strip on the back of one or both thighs

• A firm yellow, pink or orange nodule

• Swelling of the chin or lower lip

• A lump inside the mouth

• A thickened or ulcerated paw pad

• Nodules on the ears or face

Linear granulomas are classically described as pencil-like thickenings along the back of the thighs. Chin and lip granulomas can create a swollen or “pouty” facial appearance.

Granulomas may be itchy, mildly uncomfortable or apparently unnoticed by the cat. Oral granulomas can be more significant because they may interfere with chewing, swallowing or normal tongue movement.

Can a Cat Have More Than One Form?

Yes.

A cat may have an upper-lip ulcer and an eosinophilic plaque on the abdomen at the same time. Another cat may develop a chin granuloma during one flare and a linear thigh lesion during another.

This overlap is one reason EGC should be approached as an inflammatory reaction pattern rather than three entirely unrelated conditions. The appearance can change while the same underlying allergic trigger remains active.

How Worried Should You Be?

Severity	What it may look like	What to do
Mild	Small stable lip ulcer or firm lesion, no bleeding, normal appetite and no obvious pain	Arrange a veterinary examination within the next few days
Moderate	Expanding lesion, persistent licking, redness, crusting or repeated flare-ups	Book a veterinary appointment within 24 to 72 hours
Severe	Raw plaque, pus, odour, marked swelling, pain, bleeding or difficulty eating	Seek same-day veterinary care
Critical	Difficulty breathing, sudden widespread facial swelling, collapse, pale gums or inability to swallow	Go to an emergency veterinary clinic immediately

EGC itself is not usually an overnight emergency. A new lesion in an otherwise bright, comfortable cat can generally wait for a prompt daytime appointment.

The situation becomes more urgent when the lesion is rapidly progressing, infected, painful or affecting the mouth. Sudden generalised facial swelling, breathing difficulty or collapse is not typical of uncomplicated EGC and may indicate an acute allergic reaction or another emergency.

What Causes Eosinophilic Granuloma Complex?

The most common underlying cause is a hypersensitivity reaction. Important triggers include:

• Flea bite hypersensitivity

• Food-related allergic disease

• Environmental allergy

• Mosquito or other insect bite hypersensitivity

• Local irritation or trauma

• Secondary bacterial infection

• Less commonly, an unidentified or idiopathic inflammatory trigger

Some cats may have more than one allergy. A cat with environmental allergies can still react to flea bites, and a food-allergic cat can still develop secondary infection.

Flea Bite Hypersensitivity

Flea allergy is one of the first problems that should be addressed in any cat with eosinophilic skin lesions.

A sensitive cat can react strongly to flea saliva, and the number of fleas present does not necessarily match the severity of the skin disease. Cats also groom very efficiently, so affected cats may remove adult fleas and flea dirt before anyone finds them.

Flea allergy can produce all four major feline allergic reaction patterns:

• Eosinophilic granuloma complex

• Miliary dermatitis

• Head and neck itching

• Self-induced hair loss

Not seeing fleas does not reliably rule out flea allergy. Response to strict parasite control may form part of the diagnostic process.

What does strict flea control mean?

A proper flea-control trial usually requires:

• A veterinarian-recommended product that is safe for cats

• Correct treatment of every relevant dog and cat in the household

• Treatment applied consistently and on schedule

• Environmental control where an infestation is established

• Continued prevention for at least two to four months

• Ongoing year-round prevention in warm climates

Treating the affected cat once and then stopping is not enough. The household flea life cycle can continue for several months even when no adult fleas are visible.

Food Allergy

Food-related skin disease can cause eosinophilic ulcers, plaques or granulomas. Some cats also develop:

• Face, ear or neck itching

• Symmetrical overgrooming

• Recurrent ear inflammation

• Vomiting

• Diarrhoea

• Increased stool frequency

• Weight loss

The most commonly reported feline food allergens reflect commonly eaten proteins, including beef, fish and chicken. However, almost any dietary protein could potentially be involved, and a cat may become reactive to something it has eaten for years.

How is food allergy diagnosed?

A strict elimination diet is the reference-standard diagnostic method.

The diet may use:

• An extensively hydrolysed protein

• An elemental amino acid formulation

• A carefully selected novel protein

• A balanced home-prepared elimination diet designed by a veterinary nutritionist

The selected diet must be fed exclusively. Treats, flavoured medication, supplements, table scraps, toothpaste and access to another animal’s food can all invalidate the trial.

An elimination trial should generally continue for at least eight weeks. Some cats require approximately 10 weeks or longer for a reliable assessment. If the skin improves, the previous diet should be reintroduced under veterinary direction to determine whether the lesions return.

Blood, saliva and hair tests cannot reliably diagnose a food allergy in cats. Randomly changing from one commercial food to another is also not the same as performing a controlled diet trial.

Environmental Allergies

Environmental allergy in cats is now commonly described as feline atopic skin syndrome.

Potential allergens include:

• Pollens

• House dust mites

• Moulds

• Other environmental proteins

Affected cats can develop eosinophilic skin lesions, miliary dermatitis, head and neck itching or self-induced hair loss. Signs may be seasonal or present throughout the year.

Feline atopic skin syndrome is a diagnosis of exclusion. Fleas, other parasites, infection and food-related disease should be investigated before concluding that environmental allergy is responsible.

Intradermal or blood allergy testing does not independently diagnose environmental allergy. Its main role is identifying potentially relevant allergens for allergen-specific immunotherapy after the clinical diagnosis has already been made.

Mosquito and Other Insect Bite Hypersensitivity

Insect bites can trigger focal eosinophilic granulomas.

Mosquito bite hypersensitivity commonly affects exposed areas such as:

• The bridge of the nose

• Ear tips

• Eyelids

• Paw pads

Flea bites are particularly associated with chin, lip and linear thigh lesions. The distribution of the lesions and whether they occur seasonally can provide useful clues.

Are Bacteria the Cause?

Bacteria often complicate eosinophilic lesions, particularly wet plaques and ulcerated lip lesions. They are not necessarily the original reason the lesion developed.

Once the skin barrier has been damaged by inflammation and licking, bacteria can enter the tissue and intensify the reaction. This creates a cycle:

1. Allergy causes itching and inflammation.

2. The cat licks or scratches.

3. The skin becomes damaged.

4. Bacteria colonise the damaged tissue.

5. Infection creates more inflammation and discomfort.

This is why treating infection can improve the lesion without preventing another flare. The allergy or other underlying trigger still needs to be addressed.

Is Eosinophilic Granuloma Complex Contagious?

EGC itself is not contagious. It is an inflammatory reaction within the affected cat and does not spread directly between cats, other pets or people.

However, some conditions that resemble or contribute to EGC can be shared, including:

• Fleas

• Certain mites

• Ringworm

• Environmental insect exposure

More than one itchy animal in the household should therefore increase suspicion for a shared parasite or infectious condition rather than proving that the eosinophilic lesion itself has spread.

What Else Can Look Like EGC?

Not every swollen lip, raw plaque or oral nodule is eosinophilic granuloma complex.

Important alternatives include:

• Squamous cell carcinoma

• Cutaneous or oral lymphoma

• Mast cell tumour

• Ringworm

• Demodex or other mite infestation

• Bacterial pyoderma

• Deep fungal infection

• Feline chin acne

• Eosinophilic stomatitis

• Pemphigus foliaceus

• Cutaneous drug reaction

• Bite wound or abscess

• Contact irritation or trauma

• Other inflammatory oral disease

Cancer becomes particularly important when a lesion is one-sided, firm, destructive, progressively enlarging or unresponsive to appropriate treatment. Infectious and parasitic causes deserve greater consideration when several animals or people in the household develop skin lesions.

How Do Vets Diagnose Eosinophilic Granuloma Complex?

Diagnosis begins with the lesion’s appearance, distribution and history.

Your veterinarian may ask:

• When did the lesion first appear?

• Has it changed in size?

• Is your cat scratching or licking?

• Is the problem seasonal?

• What parasite prevention is used?

• Are all household pets treated?

• What foods, treats and flavoured medications does your cat receive?

• Has there been vomiting or diarrhoea?

• Are other pets or people itchy?

• Has the cat received steroids or antibiotics before?

• Did the lesion respond and then return?

A classic lesion may be strongly suspected during the physical examination, but further testing is often required to identify complications and exclude lookalikes.

Cytology

Cytology involves pressing a microscope slide against the lesion or collecting material with a swab, tape preparation or fine needle.

It may reveal:

• Eosinophils

• Neutrophils

• Bacteria

• Yeast

• Evidence of deeper infection

• Abnormal cells requiring further investigation

Cytology is particularly useful for wet plaques, pustules, crusted lesions and draining wounds.

Finding eosinophils supports an eosinophilic inflammatory reaction, but it does not identify the allergy responsible. Finding bacteria helps determine whether antimicrobial treatment is needed.

Parasite and Fungal Testing

Depending on the appearance, your veterinarian may perform:

• Flea combing

• Superficial or deep skin scrapings

• Hair examination

• A trichogram

• Acetate tape preparations

• Wood’s lamp examination

• Fungal culture

• Molecular testing for dermatophytes

These tests help exclude mites and ringworm before long-term immunosuppressive treatment is started.

Blood Tests

A complete blood count may show an increased eosinophil count, particularly in cats with eosinophilic plaques or oral granulomas.

However:

• A normal eosinophil count does not rule out EGC.

• An increased eosinophil count does not confirm EGC.

• Eosinophilia can occur with parasites, allergies and several other diseases.

Bloodwork is therefore supportive rather than diagnostic. It may also be recommended before starting long-term medication or when the cat appears systemically unwell.

Bacterial Culture

Culture and susceptibility testing may be recommended when:

• A lesion appears deeply infected

• Rod-shaped bacteria are seen on cytology

• There has been previous antibiotic exposure

• Infection repeatedly returns

• Initial treatment fails

• An oral lesion is severe

• Antimicrobial resistance is a concern

Antibiotics should be selected for a documented infection rather than prescribed automatically for every eosinophilic lesion. Current veterinary guidance specifically advises against empirical antimicrobial treatment of eosinophilic ulcers and exudative lesions when culture-guided treatment is feasible.

Skin Biopsy

A biopsy may be needed when:

• The lesion has an unusual appearance

• It is unilateral and destructive

• Cancer is a possibility

• The lesion involves the mouth

• The condition fails to respond as expected

• Nodules or masses are present

• The diagnosis remains uncertain

• Long-term immunosuppression is being considered

A biopsy can confirm the pattern of inflammation and help exclude cancer, autoimmune disease or unusual infection. It does not usually identify the exact allergen responsible.

How Is Eosinophilic Granuloma Complex Treated?

Treatment has two separate goals:

1. Settle the current lesion.

2. Identify and control the underlying trigger.

Doing only the first may produce a temporarily better-looking cat. Doing both gives the best chance of long-term control.

Treating Secondary Infection

When cytology or culture confirms bacterial infection, treatment may include:

• Topical antiseptic therapy

• Topical antimicrobial medication

• Systemic antibiotics for deeper or widespread infection

• Culture-guided treatment for recurrent or resistant infection

• Protection from further licking or scratching

Topical treatment is generally preferred where practical for localised superficial infections. Deep infections, oral lesions and widespread disease may require systemic medication.

Controlling Inflammation and Itching

Veterinarians commonly use glucocorticoids to reduce eosinophilic inflammation and itching. Oral prednisolone or another appropriate corticosteroid may produce relatively rapid improvement.

The dose and duration depend on:

• The type and severity of the lesion

• Whether infection is present

• The cat’s age

• Concurrent medical conditions

• Previous treatment response

• Whether long-term management is likely

Treatment should generally be tapered to the lowest dose and frequency that maintains control. Repeated or long-term glucocorticoid use requires monitoring because significant adverse effects can occur.

Steroids should not replace parasite control, infection management or an allergy investigation. A lesion that disappears after an injection and returns a month later has not necessarily been diagnosed or cured.

Ciclosporin and Other Immunomodulating Treatment

Modified ciclosporin may be considered for recurrent eosinophilic lesions or feline allergic skin disease, particularly when glucocorticoids are ineffective, poorly tolerated or unsuitable for long-term use.

Ciclosporin does not work immediately and can cause adverse effects, most commonly vomiting, diarrhoea or reduced appetite. Appropriate screening and monitoring are important, especially in cats that hunt or may be exposed to raw meat because immunosuppression can increase the risk of serious infection.

Other medications are sometimes used outside their registered indications in selected cats. Evidence, safety and monitoring requirements vary, so these treatments should be directed by a veterinarian familiar with feline dermatology.

Allergen-Specific Immunotherapy

Cats with confirmed or strongly suspected environmental allergy may be considered for allergen-specific immunotherapy.

This involves administering selected allergens in controlled amounts through injections or oral drops with the aim of modifying the immune response over time.

Immunotherapy:

• Is not a rapid treatment for an acute lesion

• Is usually combined with other treatment initially

• May take several months to show benefit

• Often requires up to one year before its usefulness can be judged properly

Environmental allergy testing is used to help formulate immunotherapy, not to prove that environmental allergy exists.

Are Surgery, Laser or Cryotherapy Needed?

These treatments are not routine first-line therapy for most eosinophilic lesions.

Surgical removal or another local procedure may occasionally be appropriate when:

• A solitary lesion needs to be biopsied or removed

• A persistent mass does not respond to medical treatment

• Cancer cannot be excluded

• A localised lesion repeatedly interferes with function

Removing the visible lesion without controlling the allergic trigger may not prevent another lesion from developing elsewhere.

When Is Eosinophilic Granuloma Complex an Emergency?

Go to an emergency veterinary clinic immediately if your cat develops:

• Open-mouth breathing

• Obvious difficulty breathing

• Sudden widespread swelling of the face or neck

• Pale, blue or grey gums

• Collapse

• Severe weakness

• Inability to swallow

• Uncontrollable oral bleeding

• Rapid deterioration over minutes or hours

These signs are not typical of uncomplicated EGC and may represent anaphylaxis, airway compromise or another serious condition.

Seek same-day veterinary care if:

• Your cat cannot eat because of mouth pain

• There is marked drooling or difficulty swallowing

• The lesion is rapidly expanding

• The skin is wet, bleeding or producing pus

• There is a foul smell

• A paw-pad lesion is affecting walking

• Your cat is lethargic or has stopped eating

• The tissue appears deeply ulcerated or necrotic

• An older cat has a new unilateral lip or oral lesion

A small, stable lesion in a bright cat is usually less urgent, but it should still be examined within a few days rather than watched for several weeks.

What Should You Do Right Now?

1. Check whether your cat is eating normally

Watch your cat approach, pick up, chew and swallow food.

A cat may still appear interested in food but repeatedly walk away because opening the mouth is painful. Dropping food, chewing on one side, drooling or pawing at the mouth all increase the urgency.

2. Photograph the lesion

Take clear photographs from several angles in good lighting. Include a ruler or another size reference where practical.

Repeat the photograph every one to three days. This provides a much more reliable record than trying to remember whether the lesion was slightly larger yesterday.

3. Prevent further self-trauma

If your cat is repeatedly licking or scratching a plaque, a correctly fitted Elizabethan collar or soft protective collar may be required temporarily.

The collar must not interfere with breathing, drinking, eating or normal movement.

4. Review parasite prevention

Write down:

• The exact flea product used

• The date it was last applied

• Whether the dose matched your cat’s weight

• Whether every cat and dog in the household is treated

• Whether any doses were late or missed

Do not apply an extra dose or combine products until a veterinarian has confirmed that doing so is safe.

5. List every food exposure

Include:

• Main diet

• Treats

• Table food

• Supplements

• Flavoured medication

• Dental products

• Access to another pet’s bowl

• Hunting or outdoor food sources

This information becomes essential if a diagnostic food trial is needed.

6. Do not apply random products

Avoid:

• Human steroid creams

• Human antibiotic ointments

• Human oral-ulcer products

• Hydrogen peroxide

• Rubbing alcohol

• Essential oils

• Tea tree oil

• Undiluted disinfectants

• Leftover medication

• Another animal’s prescription

Cats will lick many topical products, turning a skin treatment into an oral exposure.

7. Arrange an examination

A new lip ulcer, plaque or granuloma should generally be examined within the next few days.

Arrange same-day care if the lesion is painful, infected, rapidly progressing or interfering with eating.

Common Mistakes Owners Make

Assuming a “rodent ulcer” came from a mouse

The name is historical. These ulcers are not caused by rodents or rodent bites.

Ruling out fleas because none are visible

Highly allergic cats may groom away almost every visible flea. Flea exposure can still be responsible.

Treating only the infection

Antibiotics may settle a secondary infection but will not control flea allergy, food allergy or environmental allergy.

Repeating steroid injections without investigating the trigger

Steroids can make the lesion disappear while the underlying cause remains. Repeated flare-ups should prompt a more systematic investigation.

Changing foods repeatedly

Random diet changes do not diagnose food allergy and may make it more difficult to identify a genuinely novel protein later.

Using an allergy blood test as the diagnosis

Environmental allergy tests indicate sensitisation or exposure. They do not independently prove that an allergen is causing the lesion.

Waiting too long to biopsy an unusual lesion

A one-sided, destructive or treatment-resistant lip lesion should not be assumed to be EGC indefinitely. Cancer and infection must be excluded.

Stopping treatment when the surface first looks better

Inflammation and infection may remain beneath an improving surface. Complete the prescribed plan and attend recommended rechecks.

Can Eosinophilic Granuloma Complex Be Prevented?

Not every case can be prevented, but recurrence can often be reduced.

Helpful measures include:

• Maintain reliable cat-safe flea prevention

• Treat every relevant household pet

• Avoid missed parasite-prevention doses

• Investigate recurrent itching early

• Complete a strict food trial when recommended

• Avoid confirmed food triggers

• Record seasonal flare-ups

• Monitor the lips, chin, abdomen and thighs

• Treat secondary infection promptly

• Reduce self-trauma during active flares

• Attend follow-up examinations

• Use the lowest effective long-term medication plan

The most effective prevention strategy is usually not a special cleanser or supplement. It is identifying which trigger repeatedly activates the inflammatory response and controlling that trigger consistently.

Will Your Cat Be Okay?

The prognosis is generally good when the lesion is recognised early and the underlying trigger can be controlled.

Some cats experience one episode that resolves and never returns. Others develop chronic allergic skin disease with intermittent flare-ups requiring long-term management.

Visible improvement may begin relatively quickly once inflammation and infection are controlled, but complete resolution can take several weeks. Recurrence is common when flea exposure continues, a food trial is incomplete or an environmental allergy remains active.

Oral eosinophilic lesions can be more complicated than superficial skin lesions. Early diagnosis and multimodal treatment become particularly important when the lesion affects chewing, swallowing or deeper oral tissues.

What matters most is not whether every lesion disappears after the first medication. The real goals are:

• A comfortable cat

• Normal eating and grooming

• No infection

• No progressive tissue destruction

• Fewer flare-ups

• Less reliance on repeated high-dose medication

Frequently Asked Questions

Is eosinophilic granuloma complex cancer?

No. EGC is an inflammatory reaction pattern, not cancer. However, squamous cell carcinoma, lymphoma and other tumours can sometimes resemble eosinophilic lesions, so biopsy may be needed when the appearance is unusual or treatment fails.

Is EGC contagious to people or other cats?

No. EGC itself is not contagious. Fleas, mites and ringworm can produce or resemble similar skin problems and may affect other household animals or people.

Is eosinophilic granuloma complex painful?

It depends on the form. Indolent ulcers may cause surprisingly little discomfort, while eosinophilic plaques are usually intensely itchy. Oral granulomas, infected lesions and deep ulcers can be painful.

Can EGC go away on its own?

Some lesions may temporarily improve, but spontaneous improvement does not mean the underlying trigger has resolved. Waiting is risky when a lesion is enlarging, ulcerated or located inside the mouth.

What should I feed a cat with eosinophilic granuloma complex?

Do not select a diet based on the lesion alone. When food allergy is suspected, your veterinarian should choose an appropriate hydrolysed, elemental or novel-protein elimination diet that can be fed exclusively for at least eight weeks.

Final Thoughts

Eosinophilic granuloma complex can look alarming, but most affected cats can be managed successfully.

The most important point is that EGC is not a single diagnosis with one universal treatment. It is a visible inflammatory reaction that should prompt a search for fleas, food reactions, environmental allergy, secondary infection and important lookalikes.

The mistake I see most often is treating the lesion repeatedly without dealing with the reason it keeps returning. A short course of medication may clear the skin, but lasting control comes from identifying the trigger, protecting the damaged tissue and reassessing any lesion that does not behave as expected.

A small stable lesion is rarely a midnight emergency. A rapidly destructive lip ulcer, painful mouth lesion, infected plaque or cat that has stopped eating deserves prompt veterinary attention.

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If you are unsure whether your cat’s skin or mouth lesion can wait, or you need help monitoring a recurring flare, ASK A VET™ can help you assess the signs and decide what to do next.