<prompt> Pityriasis Versicolor is caused by:Tinea rubrumMalassezia furfurTinea capitisVaricella  <response>: Ans: b Malassezia furfurRef: Fitzpatrick Dermatology 8th ed. 806TINEAPITYRIASIS VERSICOLOR Caused by Malassezia furfur. It is usually seen in young adults and clinically presents with multiple small, scaly, hypopigmented macules that develop insidiously over the skin of chest back.Diagnosis Examination of scales in 10 KOH: Shows short hyphae round spores spaghetti Meat Ball appearance. Wood lamp examination show apple green fluorescence. Skin surface BiopsyTreatment Whitfields ointment 3 salicylic acid 6 Benzoic acid, Selenium disulphide, Sodium thiosulphate. Topical Miconazole Ketoconazole Itraconazole; Clotrimazole, Systemic KetoItraconazole Griseofulvin is not effective in case of pityriasis versicolor.Also Know Griseofulvin is used systemically for Idermatophytosis tinea infection. Griseofulvin is ineffective topically. Griseofulvin has no role in treatment of T. versicolor Candida. 