Dermatophytosis (more commonly called ringworm) is the most common infectious skin disease of cats. It is a zoonotic disease, meaning it can be spread to humans, and cat owners are often afflicted along with their pets during an outbreak. The source of a ringworm infection in an individual cat isn’t always obvious. Usually a kitten picks up its ringworm infection from another cat in the same cattery, breeding colony, shelter, or pet store. The classical appearance of feline ringworm is one or more areas of partial, patchy hair loss accompanied by some scaling and crusting, primarily on the head, face, and front legs. In most cases, cats infected with ringworm are only mildly itchy. Many factors predispose a cat to infection, including youth, presence of debilitating disease, concurrent therapy with drugs that suppress the immune system, poor nutrition, and stress. Long-haired cats such as Persians and Himalayans are more commonly affected. Despite its name, ringworm is not caused by a worm. It is a skin fungus, and treatment involves the use of oral anti-fungal medications, shampoos and/or topical ointments. Most kittens respond very well to treatment.