Large ringworm: what to know

Ringworm commonly produces an itchy, red, scaly patch with a more active edge. When it grows, separate areas can join and create an irregular shape; the centre may look less inflamed than the border. It is not caused by a worm. The infection can pass through skin contact or shared towels, clothing, sports equipment, and bedding. Eczema and other rashes can resemble it, so an examination is useful when the pattern is unusual or treatment has not helped.

Keep the area clean and dry, wash hands after touching it, and avoid scratching. Do not share towels, clothing, hairbrushes, or sports gear; wash fabrics that touch the rash and let them dry fully. A clinician or pharmacist may recommend topical antifungal treatment for suitable limited infection. A broad, extensive, recurrent, or hard-to-reach infection may need oral antifungal treatment prescribed after assessment. Use the recommended course as directed, even if the itch improves early, and avoid steroid cream alone unless a clinician advises it.

Arrange medical review when the rash covers a large area, involves the scalp, beard, or nails, keeps spreading, or has not improved with appropriate treatment. Seek prompt care for pus, marked pain, fever, facial or eye involvement, or a weakened immune system. A child, pregnant person, or anyone taking regular medicines should check treatment suitability before using an antifungal.

Ask whether the appearance is consistent with ringworm, whether testing is needed, which treatment form suits the body site, and how to prevent transmission at home. Mention contact with pets, athletes, household members with a rash, and any previous antifungal use.