Dermatophytes are a unique group of fungi that infect keratinous tissue, including skin, hair, and nails, resulting in cutaneous mycoses called dermatophytoses, tinea, or ringworm infections. This closely-related group of organisms can be categorized into one of three genera: Trichophyton, Microsporum, and Epidermophyton. Species within these genera that do not invade keratinous tissue are, by definition, not regarded as dermatophytes. As with a number of fungi, dermatophytes may exhibit two phases in their life cycle: the anamorph state (imperfect or asexual phase), which is isolated in the laboratory; and the teleomorph state (perfect or sexual phase). Not all of the teleomorphs for dermatophyte species have been identified, but the generic name for both Trichophyton and Microsporum is Arthroderma [1]. Dermatophyte infections are generally named according to the anatomic locations involved. For example, infection of the feet, nails, scalp/eyebrows/eyelashes, groin, and other body sites are termed tinea pedis, tinea unguium, tinea capitis, tinea cruris (intertrigo), and tinea corporis, respectively. A single dermatophyte species may infect several anatomic sites, and different species can result in clinically identical lesions.