Ringworm and skin rash

The rash of ringworm often begins as a small area and grows outward, leaving a more noticeable edge than centre. It may itch, scale, crack or form several patches. The pattern can vary with skin tone and body site. Atopic Dermatitis, Contact Dermatitis, Heat Rash, Intertrigo, Psoriasis and Scabies can also cause redness, itching or scaling; a Drug Rash has a different trigger and may need prompt review. Because appearance alone cannot confirm the cause, a clinician may examine the border and ask about contact with infected people, animals or shared items.

Keep the rash dry, wash hands after touching it, and avoid sharing towels, clothing, bedding or grooming tools. Do not scratch or apply several new products at once, as irritation can obscure the pattern. A clinician may recommend an antifungal medicine if ringworm is confirmed. Note where the rash started, whether it is enlarging, and any new products, medicines, pets or close contacts; these details help separate ringworm from other skin conditions.

Arrange an appointment when a rash keeps spreading, affects the face, scalp or nails, recurs, or fails to improve with appropriate care. Seek prompt help for fever, severe pain, pus, rapidly worsening swelling, or involvement near the eyes. Urgency depends on the rash's warning signs and location, not on the fact that it resembles ringworm.

What features support ringworm rather than dermatitis, psoriasis or scabies? Would a skin scraping help? Which treatment is suitable for this location, and how can I prevent transmission?