Pityriasis versicolor (tinea versicolor),a fungal infection producing a rash on the skin of a woman's back. Pityriasis versicolor is caused by a yeast,Malassezia furfur,which is believed to be the parasitic form of a common saprophytic yeast Pityrosporum orbiculaire,which may be found on normal skin. Although the infection is most common in tropical countries,it has a world-wide distribution. Climatic factors or exposure to sunlight are believed to trigger the infection in many cases | |
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