What should you know about cat hair loss ringworm?

Ringworm is a fungal infection of the outer skin and hair. Affected patches may have broken hairs, flakes, redness, or a crusted edge, though some cats show little irritation. Hair loss can also occur with parasites, allergy, self-grooming, hormonal changes, or inflammatory disorders. A clinician may examine hairs and skin, use a fungal test, and check for another explanation. [Hair Loss](/symptoms/hair-loss/) describes the symptom broadly, while [Scalp Ringworm](/conditions/scalp-ringworm/) concerns a related fungal infection in people.

Arrange a veterinary assessment and avoid sharing grooming tools, blankets, or sleeping spaces with other pets until the cause is known. Wash hands after contact and clean loose hairs from commonly used areas. Do not shave the patch or apply human hair products. If ringworm is confirmed, treatment and household cleaning need to continue according to veterinary instructions. Other explanations, including [Alopecia Areata](/conditions/alopecia-areata/), [Telogen Effluvium](/conditions/telogen-effluvium/), or [Traction Alopecia](/conditions/traction-alopecia/), are evaluated differently.

Seek prompt care when hair loss spreads quickly, the skin is raw or infected, or the cat is persistently scratching or licking. Earlier assessment is sensible for a kitten, an older cat, or an animal with reduced appetite or low energy. A person in the household who develops a new circular or scaly rash should contact a healthcare professional and mention contact with the cat.

Ask which tests can distinguish ringworm from mites or allergy, whether other pets need examination, how to clean the home, and what improvement should look like. If a medicine is suggested, ask about dosing, handling precautions, and the planned review.