Medical Definition of tinea versicolor
: a common, chronic infection of the skin especially of the trunk and shoulders that is caused by a lipophilic fungus (especially Melassezia furfur and M. globosa), that is marked by the formation of irregular, often scaly patches of discolored skin which may be either lighter or darker than the surrounding skin, and that occurs especially in warm, humid climates—called also pityriasis versicolor
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