This document discusses tinea corporis, tinea cruris, and tinea ungium (ringworm infections of the body, groin, and nails). It covers the classification, diagnosis, differential diagnosis, and treatment of these fungal infections. Key points include identifying active borders and scaling with ring-shaped rashes, using KOH preparation or biopsy for diagnosis, treating with topical antifungals and oral antifungals for severe or recurrent cases, and differentiating from conditions like eczema and candidiasis. Treatment involves topical or oral antifungals for 4-6 weeks. Laser may be used if infections are resistant to medication.