What should you know about dog has ringworm?

Ringworm is a fungal infection, not a worm. Contact with an affected dog, shed hair, bedding, grooming tools, or other contaminated items can expose the skin. In people, it may form a ring-shaped or irregular patch that becomes itchy, red, dry, or scaly. A rash after contact does not prove ringworm; eczema and other causes can look similar. See the guidance on [Ringworm](/conditions/ringworm/) and [Scaly Skin](/symptoms/skin-scaling/) for related features.

Avoid sharing towels, clothing, brushes, or bedding with the dog, and wash hands after handling it. Clean washable fabrics and follow the veterinarian’s plan for the animal, because untreated infection can keep re-exposing household members. Do not scratch or apply a steroid cream alone to an undiagnosed rash; steroids can change its appearance. A clinician may recommend [Topical Antifungal Treatment](/treatments/medical-dermatology/topical-antifungal-therapy/) or, for more extensive infection, [Oral Antifungal Treatment](/treatments/medical-dermatology/oral-antifungal-therapy/).

Arrange an appointment if the rash is spreading, involves the scalp or nails, affects a child, or does not improve with appropriate care. Seek prompt advice for pus, increasing pain, warmth, fever, or extensive irritation. A [Skin Rash](/symptoms/skin-rash/) after animal exposure deserves assessment when its cause is unclear.

Could this be ringworm or another rash? Should household contacts or the dog be assessed? Which treatment is suitable for this body area, and how should clothing, bedding, and grooming items be cleaned?