Ringworm, medically known as dermatophytosis, is a common fungal infection that targets the hair, skin, and sometimes the nails of cats. Despite the common name, ringworm is not caused by a worm; it is a microscopic fungus that feeds on dead skin cells and hair follicles. While it can affect any cat, it is most frequently observed in kittens, senior cats, or those with compromised immune systems.

Signs and Symptoms

Ringworm typically manifests as circular areas of hair loss, often surrounded by scaling, crusting, or red, irritated skin. Affected areas may look like dandruff or appear as patches of brittle, broken hairs. Some cats, known as ‘asymptomatic carriers,’ may harbor the fungus on their skin or hair without showing any visible signs of illness, making them a potential source of infection for other pets or people in the household.

Is Ringworm Contagious to Humans?

Yes, ringworm is zoonotic, meaning it can spread from pets to people. Individuals with developing or weakened immune systems—such as young children, the elderly, or those with chronic health conditions—are at the highest risk. If you suspect your cat has ringworm, it is vital to limit direct contact with their lesions and practice thorough handwashing after handling your pet until a veterinarian has confirmed the infection is under control.

Diagnosis and Treatment

To confirm a diagnosis, veterinarians typically perform a fungal culture or use specialized PCR testing on hair and skin samples. Once confirmed, treatment is tailored to the severity of the infection.

Treatment approaches generally include a combination of topical therapies (such as medicated antifungal creams, ointments, or specialized baths) and, when necessary, oral antifungal medications to clear the infection from the hair follicles. In some cases, especially with long-haired cats, trimming the hair may be recommended to help topical medications reach the skin more effectively.

Environmental Management

Because fungal spores are hardy and can persist in the environment for many months, environmental decontamination is a critical step in preventing reinfection. Regular vacuuming and steam cleaning of carpets and furniture help remove spores from the home. Frequent washing of bedding and the use of veterinary-approved disinfectants on hard surfaces are also highly effective strategies.

The Road to Recovery

Treating ringworm requires patience, as the process can take several weeks or even months to resolve completely. The goal is to continue treatment until a veterinarian confirms the infection is gone, often verified by consecutive negative cultures. With consistent care and environmental vigilance, the prognosis for a full recovery is excellent.

This blog is for informational purposes only and is not intended to provide diagnostic or treatment guidance. If you have any concerns about your pet’s health, please contact Cascade Heights Veterinary Center directly by phone at 206-403-1108,  email, or by scheduling an appointment.  Medications, supplements, and prescription diets can be conveniently ordered through our online pharmacy.