<prompt> Ptyriasis versicolor is caused by?Malassezia furfurT. RubrumE. flocculosumCandidiasis  <response>: ANSWER: A Malassezia furfurREF: ROXBURGHS Common Skin Diseases 17th edition page 299Tinea versicolor:Caused by Malassezia furfur pityrosporum ovalePresents multiple, small, hypo pigmented macules over chest and back of young adultsPerifollicular macules to begin with and then merge together.Diagnosis10 KOH mount - short and round hyphae spaghetti and meat ball appearanceGreen fluorescence on woods lamp Treatment:KetoconazoleItraconazole for systemic treatment and Miconazole clotrimazole for local application.Griesofulvin is not effective 