Skin Infections in Cats (Bacterial & Yeast)

What Causes Skin Infections in Cats?

Common underlying causes of skin infections in cats include allergic skin disease, parasites and other conditions that affect the skin barrier. Skin infections in cats typically occur when the skin barrier becomes disrupted, allowing bacteria and yeast that are normally present on the skin to overgrow and cause disease. In most cases, this occurs secondary to an underlying condition, rather than as a primary disease.

Skin infections are best understood by considering the underlying causes and contributing factors involved:

While infection is often the most visible issue, it is usually not the primary cause. Without identifying and addressing the underlying driver, infections are likely to recur or persist.

Signs of Skin Infections in Cats

Signs of skin infection in cats can vary and are often less obvious than in dogs, particularly in early or mild disease. In many cases, infection presents alongside underlying skin disease and may be localised, intermittent or subtle.

Common signs include:

• Crusting or scabbing of the skin
• Skin lesions or sores, including erosions or ulcerated areas
• Hair loss, often associated with overgrooming
• Red, inflamed or irritated skin
• Changes in coat quality or texture, including dull or uneven coat

Some cats may also show:

• Small plaques, ulcers or lesions associated with eosinophilic granuloma complex
• Subtle signs of discomfort, including increased grooming or licking
• Areas of thinning hair or barbered coat without obvious inflammation

Dermatophyte infection (ringworm) may also present with hair loss, crusting or circular areas of alopecia, and can resemble other skin conditions.

In many cases, signs may be localised or vary over time, and the distribution and recurrence of lesions often provide important clues to the underlying cause.

Why Skin Infections Become Recurrent or Chronic

Skin infections often recur because treatment focuses on the infection itself rather than the underlying condition. While infections may improve with routine or first-line treatment, they frequently return if the primary driver is not addressed.

This can lead to a self-perpetuating cycle:

• An underlying condition (such as allergy or parasites) disrupts the skin barrier
• The skin becomes inflamed and more susceptible to infection
• Bacteria or yeast overgrow
• Infection develops, contributing to further inflammation and disruption of the skin barrier
• Grooming, licking or local irritation further disrupts the skin
• The skin barrier becomes increasingly compromised

Each stage reinforces the next, leading to recurrent flare-ups and, in some cats, progression to more persistent or complex disease.

In many cats, this cycle may be less obvious, particularly where signs are subtle or intermittent, but without identifying and managing the primary cause, infection is likely to recur or persist.

How We Diagnose Skin Infections in Cats

Skin infections can resemble many other dermatological conditions and are often secondary to an underlying disease, so a systematic approach is required to confirm infection and identify contributing factors. Where referral is recommended, your cat’s assessment begins with a dermatology consultation, where our clinician reviews their history and previous treatments, and performs a thorough examination to assess the severity, distribution and progression of disease.

From here, our clinicians tailor a targeted diagnostic approach to your cat’s individual presentation.

A tailored diagnostic approach may include:

• Cytology and Fine-Needle Aspirates – used to identify bacteria, yeast and inflammatory cells, helping guide targeted treatment decisions.
• Elimination Diet Trials – used in selected cases where a food-related allergy is suspected as an underlying cause.
• Airborne Environmental Allergy Testing – used in selected cases where environmental allergy is suspected as an underlying cause of recurrent skin disease and infection, helping guide possible allergen-specific immunotherapy (ASIT).
• Biopsy and Dermatopathology – recommended in selected cases where skin disease or infection is severe, chronic or not responding as expected.
• Skin scrapings and parasite testing – where parasitic causes are suspected

Each step helps build a complete clinical picture, ensuring that treatment is based on an accurate diagnosis rather than repeated short-term management.

How Skin Infections in Cats Are Managed

Management depends on the type and severity of infection, the presence of an underlying condition, and your cat’s individual needs. Effective treatment requires not only resolving the infection, but also addressing the factors driving recurrence.

Depending on the diagnosis, treatment may include:

• Targeted antimicrobial therapy for bacterial or yeast infection
• Topical therapies, such as medicated wipes, sprays or shampoos, where appropriate
• Treatment of underlying allergy or skin disease
• Parasite control, where relevant
• Dietary management where a food-related trigger is identified
• Medications to reduce inflammation and support skin healing
• Strategies to support skin barrier function and reduce recurrence

For cats with recurrent skin infections, long-term management is often required. The goal is not simply to treat individual episodes, but to achieve more stable disease control, reduce flare-ups, and improve comfort and quality of life.

Related Conditions

Cat Allergies

Ear Disease in Cats

Nail, Paw and Pad Conditions (Pododermatitis) in Cats

Parasites in Cats

Explore other common conditions in cats here →