Bacterial folliculitis and pyoderma in particular are less common in cats than in dogs. Skin changes are therefore not immediately assumed to be an ordinary bacterial infection. Folliculitis describes where inflammation is located, but does not, by itself, identify the cause or suitable medicine.
When to see a vet urgently
Contact a vet promptly in the following situations:
- A painful swelling, deep wound or substantial pus develops on the skin.
- Skin changes spread rapidly and your cat becomes apathetic or stops eating.
- The chin or lip swells enough to make eating difficult.
- The skin is very tender or general health deteriorates during treatment.
Do not squeeze a deep, painful lesion at home. You can find a vet near you.
Overview
A hair follicle is the skin structure in which a hair forms and grows. Inflammation develops when bacteria, fungi, parasites or disturbed immune reactions affect the follicle. This causes redness, pus-filled areas, hair loss and itching. Folliculitis may be localised or extensive, acute or chronic.
Inflammation may remain in the more superficial part of the follicle or extend deeper. If the follicle ruptures and its contents enter surrounding tissue, this is called furunculosis. The lesions may then be larger than ordinary small bumps, deep and painful.
In chin acne, for example, keratin, a structural material in skin and hair, accumulates in the follicle. Blackheads may appear first, and bacteria may later infect the area. However, a black speck on the chin is not always the same as widespread bacterial folliculitis.
Causes
The main factors causing folliculitis in cats include:
- Bacterial infections, most often staphylococci.
- Fungal infections, particularly dermatophytosis, or ringworm.
- Parasites, including fleas, Demodex mites and mange mites.
- Allergic reactions, including food allergies and atopic dermatitis.
- Hormonal disorders, such as diabetes and hyperthyroidism.
- Skin injuries and scratch marks.
The list includes both direct causes and diseases that predispose the skin to inflammation. Allergy or flea-related scratching can damage skin and encourage secondary bacterial infection. However, diabetes or thyroid disease does not automatically explain every bump; testing for these also depends on other symptoms.
Different mite species also behave differently. Demodex cati lives in hair follicles, whereas D. gatoi lives in the more superficial horny layer of skin. The term mite infestation alone therefore does not indicate how deep inflammation extends. Similar crusts and pustules can also occur in immune-mediated diseases without an ordinary bacterial cause.
Risk factors
- Kittens and young cats, which more often have parasites and ringworm.
- Cats with reduced immunity.
- Cats living in crowded conditions, such as breeding catteries and shelters.
- Cats with chronic skin diseases.
- Unsuitable feeding and vitamin deficiencies.
Risks often relate to the underlying cause: contagious ringworm and parasites, for example, differ from allergy or a disease that weakens immunity. No single age or housing group common to all folliculitis can establish the diagnosis. An adult cat living alone at home can also develop hair follicle inflammation.
A skin lesion cannot establish a vitamin deficiency. A cat eating a complete, balanced diet does not usually need additional vitamin or mineral supplements. Supplements do not replace skin investigations, and unnecessarily high amounts can be harmful. Feeding is assessed separately if the diet is inadequate or your cat is losing weight.
Typical symptoms
Folliculitis in cats can cause the following signs:
- Small red bumps, or papules, around hairs.
- Pustules that burst and form crusts.
- Hair loss in affected areas.
- Itching, with scratching and licking of the coat.
- Flaky, dry skin.
- Thickening and roughening of the skin in chronic disease.
An intact pustule may go unnoticed in a cat because it ruptures or the cat licks the area. At home, you may therefore see only small crusts, scales, broken hairs or baldness. Itching is not equally severe in every cat. Conversely, intense itching can also relate to the underlying allergy or parasite.
Chin lesions may look like dirt or blackheads before swelling and pain develop. Small crusts elsewhere do not, by themselves, establish that inflammation definitely begins in the follicle. A photograph of an early lesion can help investigations if the skin changes before the appointment.
Complications and consequences
Untreated folliculitis can lead to:
- Spreading infection, including furunculosis and abscesses.
- Chronic skin inflammation.
- Systemic fungal or bacterial infection.
- Poor coat quality and baldness.
Systemic infection is not the usual next stage of every superficial folliculitis. Deep bacterial infection is more serious and carries a greater risk of bacteria entering the bloodstream. A cat with fever, not eating or clearly unwell therefore needs prompt assessment.
A ringworm lesion and a rare deeper or systemic fungal infection are different conditions. The depth of inflammation, cause and your cat's immunity affect risk. Recurrent or non-healing deep skin infection may also require investigation of an underlying systemic disease.
Diagnosis at the vet
Diagnosis uses:
- Skin examination.
- Microscopic examination of skin scrapings to look for parasites.
- Fungal cultures to rule out ringworm.
- Bacterial culture to identify the cause and select an antibiotic.
- Skin biopsy in chronic or severe cases.
- Blood tests to assess general health.
A cell sample provides information about inflammation
A cytology sample, or cell sample, from the skin is examined microscopically. This shows inflammatory cells and any bacteria or yeasts. A pustule's appearance or discharge alone is not enough to select an antibiotic. Bacterial culture and susceptibility testing may be needed for deep, recurrent or poorly responsive inflammation, for example.
The sampling site is chosen according to the lesion. A bacterium found on the surface is not always the actual cause of a deep lesion. Report previous antibiotics and skin products, because these affect the investigation plan and interpretation of findings.
Parasites, ringworm and other possibilities
Scraping depth and other sampling methods depend on the suspected parasite. Ringworm can be investigated through hair examination, culture or another appropriate test. One negative or unclear result does not always resolve the cause of all skin symptoms; it is compared with clinical findings.
An atypical, persistent or ulcerated lesion may be biopsied. This helps distinguish immune-mediated diseases and tumours from infections, for example. Blood tests investigate changes in general health where needed. Not every patient undergoes all the listed tests in the same way.
Treatment is chosen according to the cause
For bacterial inflammation, treatment may include suitable topical products for cats and an oral medicine where needed. Depth, extent, pain and test results affect the choice. A deep pus-filled lesion may also need local veterinary treatment. Confirmed ringworm or parasite infestation receives treatment effective against that cause.
The underlying cause is treated too
If allergy or a parasite sustains skin damage, controlling bacterial infection alone may not prevent recurrence. Allergy investigations continue alongside or after infection treatment where necessary. Chin acne also requires assessment of local skin care, although not all its causes are known.
An immune-mediated disease may need very different treatment from an infection. Do not start corticosteroids or other medicines that suppress inflammation yourself because of a crust or pustule. A medicine left over from similar skin changes may not suit the new situation.
Using topical treatment safely
Use only a product prescribed for your cat and the particular skin area. Your cat may lick an applied substance, so your vet will explain how to prevent licking. Check the instructions for any need for gloves and restrictions near the eyes or mouth. Report severe pain or irritation associated with treatment.
Do not squeeze bumps or forcibly pull off crusts. If pain prevents cleaning the treatment site, ask for help with the technique. Do not change instructions simply because the appearance improves quickly. Deterioration or new deep lesions require contact with the practice.
Monitoring and prognosis
Monitor the extent of lesions, itching, pain, appetite and activity. Take comparison photographs in similar conditions if this can be done without disturbing your cat. A new skin sample may be used at follow-up to assess healing; less redness alone does not always show that inflammation has completely resolved.
A treatable local cause may respond well, but recurrence is possible if a predisposing disease persists. Recurrent infections are not treated indefinitely by repeating the same medicine without reviewing the cause and response.
Prevention
- Maintain regular external parasite control for fleas and mites or ticks.
- Maintain hygiene and coat care.
- Feed a complete, balanced diet with adequate vitamins and trace elements.
- Treat allergies and skin inflammation promptly.
- Prevent fungal infections in breeding catteries.
Parasite control is chosen according to confirmed risks and a product suitable for your cat. If ringworm is suspected, possible transmission to other animals and people is considered, with separate testing and cleaning instructions agreed. However, not every cause of folliculitis is contagious.
A complete, balanced diet supports skin function, but vitamins are not added as a precaution. Check skin condition during grooming too. If your cat cannot groom normally or skin symptoms recur, treating the underlying cause is more effective than simply cleaning more vigorously.
Important for cat owners
Folliculitis is more than a cosmetic defect: it is a sign of internal disturbances or infections. Remember not to ignore skin changes; take your cat to a vet at the first signs of skin inflammation and hair loss. Finding and treating the cause early prevents complications and restores a healthy coat.
Early investigation improves the chances of managing disease, but complete, permanent recovery cannot be promised for every cat. Prognosis depends on the cause, depth of inflammation and any long-term underlying disease.
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
Is folliculitis always bacterial?
No. Ringworm, a parasite or another skin disease may underlie hair follicle inflammation. Bacterial infection can also be secondary to another problem. Investigations determine treatment choice.
Does a cat always need an antibiotic?
Not for every bump or crust. The role of bacteria, depth of inflammation and samples are assessed first. An antibiotic alone does not treat ringworm or mites, for example.
Can I squeeze blackheads on my cat's chin?
Do not squeeze painful or inflamed lesions at home. Chin swelling and pustules need examination, and a topical treatment suitable for cats is selected.
Can folliculitis spread to another cat?
It depends on the cause. Ringworm or certain parasites can spread, for example, but not every underlying cause is contagious. Investigation and treatment of contact animals are planned according to the diagnosis.
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
- Pyoderma in Dogs and Cats, Merck Veterinary Manual, accessed 2026-11-03.
- Pyoderma in Cats, Merck Veterinary Manual, accessed 2026-11-03.
- Chin Acne in Cats, VCA Animal Hospitals, accessed 2026-11-03.
- Diagnosis of Skin Diseases in Small Animals, Merck Veterinary Manual, accessed 2026-11-03.
- Control of Ectoparasites in Dogs and Cats, European Scientific Counsel Companion Animal Parasites, accessed 2026-11-03.
- Guideline for Dermatophytosis in Cats, ABCD, accessed 2026-11-03.
- Feline immune-mediated skin disorders: Part 1, Journal of Feline Medicine and Surgery, accessed 2026-11-03.
- Feeding Your Cat, Cornell Feline Health Centre, accessed 2026-11-03.
- Applying Ointments, Creams, and Lotions on Cats, VCA Animal Hospitals, accessed 2026-11-03.
- Diagnostic testing, AAHA/AAFP, accessed 2026-11-03.
