Ringworm in Cats
Ringworm in cats is one of the most common skin infections in felines, especially those living in colonies, shelters, or with weakened immune systems. Although it often looks severe due to its appearance, ringworm is treatable with proper diagnosis and specific hygiene measures. Below, we explain everything you need to know to recognize it, differentiate it from similar conditions, and treat it effectively.
What is ringworm in cats?
Ringworm is a fungal (mycotic) infection that affects the skin, hair, and, in some cases, the nails of the cat. It is mainly caused by dermatophyte fungi, with Microsporum canis being the most common. Despite its name, it has no relation to worms — it’s called “ringworm” because of the circular lesions it usually causes.
This fungus spreads easily through direct contact with an infected animal or indirectly through contaminated objects such as brushes, blankets, or furniture. Young, elderly, long-haired, or immunocompromised cats are the most vulnerable, and in many cases, they may carry the fungus without showing visible symptoms, acting as silent carriers.
Common symptoms of ringworm in cats
Circular hairless lesions
One of the most characteristic signs of ringworm is the appearance of round, hairless patches that may show redness, flaking, or a grayish crust. These lesions typically appear on the head, legs, back, or around the neck.
Although they may go unnoticed at first, if left untreated, the infection spreads, and the bald areas increase in size. In more advanced cases, multiple lesions may appear throughout the body, causing discomfort and itching.
Itching and excessive scratching
Although not always present, itching is another possible symptom. Some cats scratch the affected areas intensely or lick themselves frequently, which can worsen the lesions and cause secondary bacterial infections.
Persistent scratching can also lead to skin inflammation, thickening, or open wounds, complicating diagnosis and causing confusion with other conditions such as allergies or dermatitis.
Affected nails and paw pads
In some cases, ringworm can spread to the nails, causing deformities, thickening, or color changes. Although less common, when this occurs, it is usually associated with a deeper infection that requires prolonged treatment.
Paw pads may also develop lesions, crusts, or abnormal dryness. These signs should be evaluated by a veterinarian to confirm whether they are related to dermatophyte infection.
Difference between ringworm and mange in cats
- Cause
- Ringworm: fungal infection caused by dermatophytes.
- Mange: infestation caused by mites (such as Sarcoptes or Notoedres).
- Contagion
- Ringworm: can be transmitted to humans (zoonosis).
- Mange: some types are highly contagious, but not all affect humans.
- Symptoms
- Ringworm: circular hairless patches, flaking, and mild itching.
- Mange: intense itching, crusts, and thickened skin.
- Diagnosis
- Ringworm: diagnosed with Wood’s lamp, fungal culture, or microscopic examination.
- Mange: diagnosed through skin scrapings and microscopic observation.
- Treatment
- Ringworm: topical and oral antifungal medications.
- Mange: specific antiparasitic treatments.
Treatment of ringworm in cats
Treatment for ringworm in cats must be supervised by a veterinarian, as it involves not only curing visible lesions but also controlling the spread of the fungus and preventing relapses. There are two main types of treatment: topical and systemic, usually combined with strict environmental hygiene measures.
Topical treatment
Topical treatment involves applying antifungal products directly to the affected areas. The most common include creams, ointments, or sprays containing miconazole, clotrimazole, or enilconazole. Their goal is to eliminate the fungus from the skin’s surface and prevent further spread.
In more extensive cases or when multiple lesions are present, antifungal medicated shampoos are also recommended to treat affected areas and remove spores from the coat. Topical treatment must be consistent, following veterinary instructions and ensuring the product remains in contact with the skin long enough to be effective.
Systemic (oral) treatment
When the infection is severe or does not respond to topical treatment, oral antifungal medication is prescribed, such as griseofulvin, itraconazole, or terbinafine. These drugs act from within the body, fighting the fungus more deeply and effectively.
Oral treatment usually lasts several weeks and requires veterinary monitoring to assess effectiveness and possible side effects, especially in cats with liver or kidney conditions. Although it may seem more aggressive, it is essential in persistent cases or multi-pet households.
Environmental disinfection measures
Ringworm is highly contagious, and its spores can survive in the environment for months. Therefore, disinfecting the surroundings is crucial to prevent reinfection. Floors, fabrics, toys, and surfaces should be cleaned daily using antifungal products such as diluted bleach (1:10) or specific veterinary disinfectants.
It’s also advisable to vacuum carpets, sofas, and pet beds frequently, remove contaminated hair, and wash all fabrics the cat has touched in hot water. In some cases, restricting the cat’s access to certain areas of the home during treatment may be necessary.
Ringworm in cats and humans: what you should know
- Ringworm is zoonotic: it can spread from cats to humans, especially in children, the elderly, or people with weakened immune systems.
- Use gloves and wash your hands thoroughly: when applying treatments or handling an infected cat, maintain good personal hygiene.
- Avoid prolonged contact with lesions: do not pet affected areas and prevent the cat from sleeping in your bed during treatment.
- Check all your pets: if multiple animals live together, they might also be infected even if they show no symptoms.
- Consult your doctor: if you notice circular, red, or itchy lesions on your skin, see a dermatologist. Treatment in humans is usually simple with antifungal medications.
Could your cat have ringworm or do you need veterinary advice? If you have doubts about symptoms or the most appropriate treatment, it’s best to visit a veterinarian specializing in feline dermatology. Early diagnosis helps prevent contagion and speeds up recovery.
Beyond veterinary treatment, remember that good nutrition is key to strengthening your cat’s immune system. A well-nourished cat has more defenses to fight infections like ringworm. At Only Fresh, we believe your pet’s well-being starts from within — that’s why we design natural cat food recipes, balanced and tailored to every stage of life. Because taking care of their health begins with nutrition.
