# Pyoderma in Cats: Causes, Symptoms, and Treatment Pyoderma in cats is a bacterial skin infection that usually develops because something else is irritating or damaging the skin. It is uncommon in cats compared with dogs, and it almost always has an underlying trigger such as allergies, fleas, mites, or chin acne [1]. This article is educational and is not a substitute for veterinary diagnosis or treatment. ## Quick Answer - Pyoderma means "pus in the skin" and most often refers to a bacterial infection of the skin and hair follicles [2]. - The most common sign is heavy scaling, especially on the back near the tail, along with small solid bumps called miliary dermatitis [1]. - Intact pimples or pustules are almost never found on cats, so owners often miss the infection [1]. - Antibiotics alone often fail because the underlying cause (allergies, parasites, or another disease) is still active [1][2]. - Any cat with open sores, draining wounds, or crusted bloody areas needs a veterinary visit, because deep infections can signal a serious underlying illness [1]. ## What Is Pyoderma in Cats? The word pyoderma literally means "pus in the skin" [2]. It is an umbrella term for any skin disease that produces pus-filled inflammation, whether the cause is infection, inflammation, immune disease, or cancer [2]. In everyday veterinary use, though, pyoderma usually means a bacterial infection of the skin, including bacterial folliculitis (infection of the hair follicles) and bacterial dermatitis [2]. Bacterial pyoderma in cats is not common [1]. When it does happen, it is usually caused by an overgrowth of bacteria that normally or temporarily live on the skin [1]. These bacteria are not invaders from the outside. They take advantage of skin that has been weakened, scratched, or inflamed. This is one of the biggest differences between cats and dogs. In dogs, pyoderma is a routine diagnosis and Staphylococcus pseudintermedius is the main culprit [3]. In cats, superficial pyoderma is traditionally considered rare, and the bacteria involved are more varied [4]. A study of 41 allergic cats with superficial pyoderma in Italy found staphylococci in 36 of them, with an uneven mix of species instead of one dominant organism [4]. That matters for treatment, because the bacteria causing your cat's infection may not be the same one causing a dog's. ## Symptoms of Pyoderma in Cats The signs of pyoderma in cats depend on how deep the infection goes [2]. Superficial infections look very different from deep ones. ### Superficial pyoderma The most common sign is excessive scaling, particularly on the back near the tail [1]. The scales are often pierced by hairs, which is a clue your veterinarian will look for [1]. Small, solid bumps on the skin, called miliary dermatitis, are also common [1]. Here is the tricky part. Intact pustules, the little pimples you might expect with a skin infection, are almost never found on cats [1]. So you may never see pus at all. Instead you may notice: - Flaky, scaly skin along the spine - Tiny scabs or bumps that feel like millet seeds - Mild redness or thinning hair - Your cat grooming or scratching more than usual ### Deep pyoderma When the infection moves deeper into the skin, the signs become more obvious and more serious. Hair loss, open sores (ulcers), bloody crusts, and draining wounds are usually seen with deep pyoderma [1]. These lesions are painful, and your cat may resist being touched in those areas. Deep pyoderma in cats that keeps coming back or never heals can be linked to multisystem disease, including infection with feline immunodeficiency virus (FIV) or feline leukemia virus (FeLV), or atypical mycobacteria [1]. That is why a deep or nonhealing infection deserves a full workup, not just another round of antibiotics. If your cat has a skin infection with discharge, crusting, or odor, our guide to [cat skin infection signs and treatment options](/knowledge/veterinary-medicine/skin-allergy-and-ear-care/cat-skin-infection) can help you understand what you are seeing. ## Causes and Risk Factors Pyoderma in cats is usually secondary. Something else damages the skin barrier first, and bacteria move in afterward [1]. ### The underlying triggers Common triggers include allergies, flea or mite infestation, and chin acne [1]. Any disease that causes itching and self-trauma can trigger a pyoderma [1]. That last point is broad on purpose. If your cat scratches, chews, or licks a spot raw, that broken skin becomes a doorway for bacteria. Allergic skin disease is a major player. In the Italian study of allergic cats, staphylococci were isolated from the majority of cats with superficial pyoderma, which supports the idea that allergy and bacterial infection often travel together [4]. ### Why location matters Warm, moist areas of the skin have an increased risk of infection, including the areas around the mouth, the genitals, and the toes [1]. If your cat has chin acne, lip fold irritation, or moist skin between the toes, watch those spots closely. ### When the immune system is involved Recurrent, nonhealing deep pyoderma can be associated with FIV, FeLV, or atypical mycobacteria [1]. Cats with these conditions may not fight off a skin infection the way a healthy cat would. ### Antibiotic resistance Resistance is a real concern in skin infections. Staphylococci that cause pyoderma in pets are a global health concern, and multidrug-resistant strains have been identified in samples from both dogs and cats [5]. In the Italian cat study, antimicrobial resistance patterns varied among the staphylococcal isolates [4]. This is one reason your veterinarian may recommend a culture instead of guessing at an antibiotic. ## How Veterinarians Diagnose Pyoderma in Cats Diagnosis starts with a hands-on exam and a close look at the lesions. Because cats rarely form visible pustules, your veterinarian may rely on other clues, like scaling, crusts, and miliary bumps [1]. Expect some combination of the following: - Cytology. A sample is taken from the skin surface or a lesion and examined under a microscope to confirm bacteria and inflammatory cells. Cytologic evaluation is part of the standard diagnostic approach [2]. - Skin scrapings and hair samples. These help rule out dermatophytosis (ringworm) and identify parasites such as mites [2]. - Bacterial culture and susceptibility testing. This identifies which bacteria are present and which antibiotics are likely to work. Culture is part of the recommended diagnostic workup [2]. - Testing for underlying disease. If the pyoderma is deep or keeps returning, your veterinarian may recommend testing for FIV, FeLV, or atypical mycobacteria [1]. - Allergy workup. If allergies are suspected as the trigger, your veterinarian may discuss diet trials or allergy testing. | What your vet checks | Why it matters | |---|---| | Cytology | Confirms bacteria and inflammation on the skin [2] | | Skin scraping and hair exam | Rules out mites and ringworm [2] | | Bacterial culture | Guides antibiotic choice and detects resistance [2] | | FIV and FeLV testing | Deep or nonhealing pyoderma can be linked to these viruses [1] | | Allergy evaluation | Allergies are a common underlying trigger [1] | ## Treatment Options for Pyoderma in Cats Treatment for pyoderma in cats has three parts: topical therapy, systemic antimicrobials when needed, and control of the underlying condition [2]. Skipping that third part is the most common reason treatment fails. ### Topical therapy Topical treatment is often the backbone of care. Depending on the lesions, your veterinarian may recommend medicated shampoos, wipes, sprays, or ointments. Topical therapy is listed as a core part of pyoderma treatment [2]. For cats, the challenge is often practical. Many cats dislike baths, so medicated wipes or spot treatments may be easier to apply consistently. ### Systemic antibiotics When antibiotics are needed, they should be chosen appropriately, ideally based on culture results [2]. Your veterinarian will calculate the dose from your cat's weight and health status, and will set the length of the course. Do not stop early because the skin looks better. Stopping too soon is a common way to create resistant bacteria and a relapse. Resistance is not a theoretical worry. Multidrug-resistant staphylococci have been isolated from pyoderma in both dogs and cats [5], and resistance patterns in cats with allergic skin disease vary from case to case [4]. If your cat has had multiple antibiotic courses, a culture becomes even more valuable. ### Treating the underlying cause This is where long-term success lives. If allergies are driving the infection, the allergies need management. If fleas or mites are involved, parasite control is needed. If chin acne is the trigger, that needs attention too [1]. Antibiotics alone may fail because the skin keeps getting re-injured and re-infected [1][2]. ### Supportive care Your cat may need pain relief if the lesions are deep or ulcerated. An Elizabethan collar can stop licking and scratching while the skin heals. Keeping the affected area clean and dry supports recovery. ## Recovery, Outlook, and Long-Term Management Superficial pyoderma often improves with consistent treatment, but the timeline depends on depth, the underlying cause, and whether resistant bacteria are involved. Your veterinarian will set recheck appointments to confirm the infection has cleared, not just faded from view. Deep pyoderma takes longer and carries a more guarded outlook. Recurrent, nonhealing deep pyoderma in cats can be associated with FIV, FeLV, or atypical mycobacteria, so the skin may be a window into a larger health problem [1]. For long-term management, focus on these habits: - Keep up with flea and parasite prevention. - Follow your allergy management plan if one is in place. - Treat chin acne and other skin irritations early. - Watch for the return of scaling, bumps, or scabs, especially near the tail. - Keep every recheck appointment, even if the skin looks normal. If your cat also has ear problems, skin disease and ear disease often appear together. Our articles on [cat ear infection with black discharge](/knowledge/veterinary-medicine/skin-allergy-and-ear-care/cat-ear-infection-black-discharge) and [ear infections in cats symptoms](/knowledge/veterinary-medicine/symptom-guides/ear-infections-in-cats-symptoms) explain what to look for. ## Prevention You cannot always prevent pyoderma, but you can lower the odds by controlling the triggers [1]. - Control fleas and mites year-round. Parasite infestation is a common trigger [1]. - Manage allergies. Allergic skin disease is a frequent underlying cause [1]. - Keep the skin clean and dry, especially around the mouth, genitals, and toes [1]. - Address chin acne early instead of waiting for it to spread [1]. - Reduce scratching and licking. Any disease that causes itching and self-trauma can trigger pyoderma [1]. - Keep up with wellness care, especially if your cat has FIV or FeLV. ## Limitations and When to Contact a Veterinarian This article cannot tell you whether your cat has pyoderma, what bacteria are involved, or which treatment is right. Every case needs a veterinarian who can examine the skin, run tests, and account for your cat's overall health. Contact your veterinarian the same day if you notice: - Open sores, ulcers, or draining wounds [1] - Bloody crusts or widespread hair loss [1] - Rapidly spreading redness, swelling, or pain - A bad odor from the skin - Your cat is hiding, not eating, or acting painful Seek emergency care now if your cat is lethargic, breathing hard, has a fever, or has a wound that is rapidly worsening. Deep skin infections can become serious, and severe complications from pyoderma have been documented in pets [6]. Schedule a routine visit if you see: - Persistent scaling on the back near the tail [1] - Small solid bumps or scabs that do not resolve - Repeated episodes of skin problems after treatment - Chin acne that is getting worse If your cat is straining to urinate or having litter box accidents, that is a separate problem. See our guide to [urinary tract infection symptoms and treatment in cats](/knowledge/veterinary-medicine/symptom-guides/urinary-tract-infection-symptoms-cats-treatment). ## Frequently Asked Questions ### Is pyoderma in cats contagious? Bacterial pyoderma is generally not considered contagious between cats in the way a virus is. The bacteria involved usually come from the cat's own skin, and the infection starts because of an underlying trigger [1]. That said, resistant bacteria can potentially spread between animals and people, so good hygiene around infected skin is sensible [7]. ### Can pyoderma in cats clear up on its own? Mild superficial cases may improve if the underlying trigger resolves, but most cases need treatment. Because the infection is usually secondary to allergies, parasites, or another condition, the skin will keep flaring until that cause is addressed [1]. Waiting also allows a superficial infection to become deep. ### Why did my cat's pyoderma come back after antibiotics? Relapse usually means the underlying cause was never controlled. Allergies, fleas, mites, and chin acne can keep damaging the skin and allow bacteria to return [1]. Resistant bacteria are another possibility, which is why culture and susceptibility testing are part of the diagnostic workup [2]. ### Do cats with pyoderma always have pimples? No. Intact pustules are almost never found on cats, which is one reason the condition is easy to miss [1]. The most common sign is heavy scaling, especially on the back near the tail, along with small solid bumps called miliary dermatitis [1]. ### Can I use my dog's skin medication on my cat? No. Cats and dogs have different skin diseases, different common bacteria, and different drug tolerances. Some medications that are safe for dogs are toxic to cats. Treatment should be chosen by a veterinarian based on your cat's specific diagnosis [2]. ## Related Articles - [Cat Skin Infection: Signs and Treatment Options](/knowledge/veterinary-medicine/skin-allergy-and-ear-care/cat-skin-infection) - [Cat Ear Infection with Black Discharge: Causes and Treatment](/knowledge/veterinary-medicine/skin-allergy-and-ear-care/cat-ear-infection-black-discharge) - [Ear Infections In Cats Symptoms](/knowledge/veterinary-medicine/symptom-guides/ear-infections-in-cats-symptoms) - [Cat Ear Infection with Hair Loss: Causes and Treatment](/knowledge/veterinary-medicine/skin-allergy-and-ear-care/cat-ear-infection-hair-loss) - [Urinary Tract Infection Symptoms Cats Treatment](/knowledge/veterinary-medicine/symptom-guides/urinary-tract-infection-symptoms-cats-treatment) - [Symptoms Of Urinary Infection Cats](/knowledge/veterinary-medicine/symptom-guides/symptoms-of-urinary-infection-cats) - [Pyoderma Gangrenosum in Cats: Rare Skin Disease Explained](/knowledge/veterinary-medicine/skin-allergy-and-ear-care/pyoderma-gangrenosum-cats) - [Fungal Skin Infections in Cats: Signs and Treatment](/knowledge/veterinary-medicine/skin-allergy-and-ear-care/fungal-skin-infection-cats) - [Cat Skin Necrosis: Causes, Signs, and Treatment](/knowledge/veterinary-medicine/skin-allergy-and-ear-care/cat-skin-necrosis) ## References 1. [Pyoderma in Cats - Cat Owners](https://www.merckvetmanual.com/cat-owners/skin-disorders-of-cats/pyoderma-in-cats). Merck Veterinary Manual. 2. [Pyoderma in Dogs and Cats - Integumentary System](https://www.merckvetmanual.com/integumentary-system/pyoderma/pyoderma-in-dogs-and-cats). Merck Veterinary Manual. 3. [Prevalence and antibiotic resistance profile of Staphylococcus pseudintermedius in pyodermic dogs in Asia: a systematic review and meta-analysis](https://pubmed.ncbi.nlm.nih.gov/42065810/). Veterinary research communications, 2026. 4. [Staphylococci isolated from cats in Italy with superficial pyoderma and allergic dermatitis: Characterisation of isolates and their resistance to antimicrobials](https://pubmed.ncbi.nlm.nih.gov/36221849/). Veterinary dermatology, 2023. 5. [Whole Genome Sequence Analysis of Multidrug-Resistant Staphylococcus aureus and Staphylococcus pseudintermedius Isolated from Superficial Pyoderma in Dogs and Cats](https://pubmed.ncbi.nlm.nih.gov/40723946/). Antibiotics (Basel, Switzerland), 2025. 6. [Microbiological and clinical aspects of complicated canine pyoderma: A case report](https://pubmed.ncbi.nlm.nih.gov/42375301/). Open veterinary journal, 2026. 7. [Risk Factors for Antimicrobial Resistance of Staphylococcus Species Isolated from Dogs with Superficial Pyoderma and Their Owners](https://pubmed.ncbi.nlm.nih.gov/35878323/). Veterinary sciences, 2022. ## Further Reading - [Merck Veterinary Manual: Cat Owners](https://www.merckvetmanual.com/cat-owners) - [Cornell Feline Health Center: Health Information](https://www.vet.cornell.edu/departments-centers-and-institutes/cornell-feline-health-center/health-information) - [American Veterinary Medical Association: Pet Care](https://www.avma.org/resources-tools/pet-owners/petcare)