Untreated ringworm: what to know

Ringworm is a contagious fungal infection of the outer skin. Without effective treatment, an itchy patch may continue expanding at its edge, develop more scale, or appear in additional areas after scratching or contact. The fungus can transfer through shared towels, clothing, bedding, sports equipment, or close skin contact. A persistent [Skin Rash](/symptoms/skin-rash/) or [Scaly Skin](/symptoms/skin-scaling/) is not proof of ringworm, because several conditions can look alike. Diagnosis helps avoid delaying the right care.

Arrange advice from a clinician or pharmacist, especially when the site is the face, scalp, nails, or a large area. Keep the affected skin dry, wash hands after touching it, avoid scratching, and do not share personal fabrics. Wash clothing and towels that contact the area and let them dry fully. Localized skin infection may respond to [Topical Antifungal Treatment](/treatments/medical-dermatology/topical-antifungal-therapy/), while some sites or more extensive disease require [Oral Antifungal Treatment](/treatments/medical-dermatology/oral-antifungal-therapy/).

Seek prompt care for fever, pus, severe tenderness, rapidly increasing swelling, or redness spreading quickly. Arrange a review when the rash affects the eye area, scalp, or nails, returns repeatedly, or fails to improve with correctly used treatment. People with reduced immunity may need earlier assessment.

Does this look like ringworm or another condition? How should I protect household members? Which treatment suits the body site? When should persistent scale or spread prompt a follow-up?