Pityriasis Versicolor

A 32-year-old woman from Mumbai with a history of excessive sweating and oily skin presents with a 4-month history of progressive hyperpigmented and hypopigmented patches on her chest, neck, and upper back. The lesions are asymptomatic and do not blanch with pressure. She has been applying topical corticosteroids for the past 2 months without improvement. On examination, fine scale is noted on the lesions. Wood's lamp examination shows yellow-green fluorescence. What is the most appropriate first-line treatment for this condition?

A 28-year-old male software engineer from Bangalore presents with a 6-month history of asymptomatic, hypopigmented patches on his trunk and upper back. The lesions are non-pruritic but cosmetically concerning. On examination, he has well-demarcated, fawn-coloured macules with fine scale on the chest and shoulders. KOH mount of scale shows short hyphae and yeast cells described as 'spaghetti and meatballs' appearance. Wood's lamp examination reveals yellow-green or coppery-orange fluorescence. What is the most likely causative organism?

A 28-year-old man from Mumbai presents with a 6-month history of asymptomatic, hypopigmented patches over his chest and back. The lesions are non-pruritic and non-scaly to the naked eye. On examination, fine scale becomes apparent on gentle scratching. KOH mount of scale shows short, stubby hyphae and round yeast cells in clusters ('spaghetti and meatballs' appearance). Wood's lamp examination reveals coppery-orange or gold fluorescence. What is the most likely diagnosis?

A 32-year-old woman from Bangalore with a history of recurrent pityriasis versicolor presents with hyperpigmented patches over her trunk and shoulders that have worsened over the past 3 months despite topical antifungal therapy. She reports that the lesions were hypopigmented initially but have become darker. She has oily skin and lives in a humid climate. What is the most likely reason for the hyperpigmentation pattern in this patient?