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Tinea versicolor
Definition:
Tinea versicolor is a chronic fungal infection of the skin. Alternative Names:
Pityriasis versicolor Text Continues Below
Causes, incidence, and risk factors:
Tinea versicolor is a relatively common skin infection caused by the fungus Pityrosporum ovale, a type of yeast. This fungus is considered part of the normal flora (microorganisms that normally occur) on human skin, and only becomes troublesome under certain circumstances. The most commonly affected sites are the back, underarms, upper arms, chest, and neck. The typical lesion is a flat discoloration with a sharp border and fine scales. The lesions are typically dark tan with a reddish cast. In African Americans, pigmentary changes are common with hypopigmentation (loss of color) or hyperpigmentation (increase in skin color). Itching may be present. Tinea versicolor is more common in hot climates and is associated with increased sweating. It occurs more commonly in adolescents and young men.
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