Tinea Corporis (Ringworm)
Symptoms
Tinea corporis produces round, scaly plaques with raised, red borders and central clearing. Lesions expand outward and may itch intensely. Multiple rings can coalesce into larger polycyclic patterns. Hair within lesions may break off or become brittle. Scratching can lead to secondary bacterial infection.
Cause
Dermatophyte fungi—typically Trichophyton rubrum—invade keratinized tissues of the body. Infection spreads via direct skin contact, contaminated surfaces, or infected animals. Warm, humid environments and tight clothing promote fungal growth. Minor skin trauma facilitates entry. Immunocompromised individuals may develop extensive disease.
Treatment
Topical antifungals such as terbinafine or clotrimazole applied for 2‑4 weeks usually suffice. Oral antifungals are needed for extensive or refractory cases. Keeping skin clean and dry, wearing breathable fabrics, and avoiding shared towels prevent reinfection. Treating household contacts or pets may be necessary. Continue treatment one week beyond clinical clearance to prevent relapse.
Dr. Beth Schulz-Butulis
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