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A 55-year-old woman presents with a red pruritic area on her face for 3 months (Figure 135-1). The annular distribution immediately is suspicious for a dermatophyte infection. Further investigation demonstrates that the patient has severe tinea pedis in a moccasin distribution. The patient is treated with an oral antifungal agent and her fungal infection clears over the coming month.
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Fungal infections of the skin and mucous membranes are ubiquitous and common. There are many types of fungus that grow on humans but they all share a predilection for warm and moist areas. Consequently, hot and humid climates promote fungal infections, but many areas of the skin can get warm and sweaty even in cold climates, such as the feet and groin.
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Pityriasis versicolor equals tinea versicolor.
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Mucocutaneous fungal infections are caused by:
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- Dermatophytes in three genera: Microsporum, Epidermophyton, and Trichophyton. There are approximately 40 species in the three genera and these fungi cause tinea pedis and manus, tinea capitis, tinea corporis, tinea cruris, tinea faciei, and onychomycosis (Figures 135-1 to 135-6).
- Yeasts in the genera of Candida and Pityrosporum (Malassezia)—There are also multiple types of species and the Pityrosporum that cause seborrhea and tinea versicolor (Figures 135-7 and 135-8). Although tinea versicolor has the name tinea in it, it is not a true dermatophyte and may be best called pityriasis versicolor.
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