Pityriasis versicolor

    Also known as: tinea versicolor, tinea flava, dermatomycosis furfuracea, chromophytosis

    Clinical Features:

    • Caused by the yeast Malassezia furfur and sometimes other species of Malassezia
    • Most common in tropical zones; in temperate zones most common in the summer
    • Small scaly macules, most often on the upper body, enlarge and become either hypo- or hyperpigmented.

    Histologic Feature:

    • Hyperkeratosis
    • Slight acanthosis
    • Spotty pigmentation of the basal layer
    • Superficial perivascular mononuclear infiltrate
    • On fungal stains, the organisms, seen as spores and short hyphae (described as having a "spaghetti and meatballs" appearance) are visible within the stratum corneum.
    External Links:

    Cases associated with this book:

  • Pityriasis versicolor
    Author: Stephen Lyle, M.D., Ph.D.

    Conference: DermatopathologyConsultations.com Teaching Collection