This document discusses three genera of fungi (Trichophyton, Microsporum, Epidermophyton) that can cause infections of the skin, hair, and nails. It then describes different clinical presentations of tinea capitis (scalp ringworm), including nonscarring alopecia and scaling, as well as a boggy scalp swelling called kerion. Examples are given of tinea pedis (athlete's foot), along with general measures for treatment such as keeping the infected area dry and avoiding synthetic clothes. Specimen collection involves examining hair shafts for spores in tinea capitis or skin scrapings to view fungal hyphae.