🐾 Quick answer: Cat ringworm is a fungal infection that causes circular hair loss and spreads to other pets and humans. Learn the symptoms, how it's diagnosed, treatment with antifungal medication, and how to decontaminate your home.
Despite the name, ringworm has nothing to do with worms. It’s a fungal infection — and one of the most contagious conditions your cat can get. It spreads between cats, dogs, and humans, which makes prompt identification and treatment important for the whole household.
What Is Ringworm?
Ringworm is caused by fungi called dermatophytes — most commonly Microsporum canis in cats. These fungi infect the outer layer of skin, hair, and nails.
Signs in Cats
- Circular patches of hair loss — often on the face, ears, and forelimbs first
- Scaly, crusty, or reddened skin in the bald patches
- Broken, stubby hairs around the edges of lesions
- Occasionally: itching (though less pronounced than in dogs)
Treatment
- Antifungal shampoo (miconazole/chlorhexidine) — twice weekly bathing
- Oral antifungal medication (itraconazole or terbinafine) — essential for widespread infections
- Environmental decontamination — crucial. Ringworm spores survive up to 18 months. Vacuum frequently, disinfect surfaces with diluted bleach (1:10), wash bedding in hot water
Protecting Humans and Other Pets
Ringworm is zoonotic — it spreads to humans, appearing as red, circular, itchy rings on the skin. Children, elderly people, and immunocompromised individuals are most vulnerable. Wear gloves when handling an infected cat and keep them isolated from other pets during treatment.
- Any suspicious circular hair loss or scaly skin lesions on your cat
- Any human developing circular skin lesions after contact with the cat
- Kitten with hair loss — kittens are highly susceptible
- Not improving after 2–3 weeks of treatment
Ringworm is thoroughly treatable — it just requires patience, consistency, and attention to environmental decontamination. Most cats make a full recovery within 2–4 months.
The PawPulse Team
Researched using current veterinary guidelines. Always consult your vet for medical advice about your pet.