Hello and welcome to healthcaremagic Pityriasis versicolor is a superficial fungal infection caused by Malassezia Furfur. The infection is more common in hot and humid weather conditions, which favor the growth of the fungus. Clinically it presents as light colored patches with fine, brawny scaling and post-inflammatory hypopigmentation. A single oral dose of an oral antifungal e.g fluconazole 400 mg is curative OR Itraconazole 200 mg once daily for a week, is an alternative. If i were your treating dermatologist, i would have also asked you to apply 2% ketoconazole lotion over the whole affected while showering and leave it on for 5 minutes daily for 5 days. Post-inflammatory hypopigmentation takes some time to respond. Repigmentation can be hastened by daily sun exposure for 5-10 minutes Repeated recurrences are common and the patches may seem to persist for ever, with new patches appearing while older one resolve. Those who have repeated recurrences should use a prophylactic 3 days therapy with topical antifungals, every month i.e 2% ketoconazole lotion over the whole affected while showering and leave it on for 5 minutes daily for 5 days. Regards