Well you already have the different diagnosis in front of you. ​​This presentation can be seen with many skin diseases - pityriasis versicolor, vitiligo and sun spots. The best option is to consult a Dermatologist in person to understand the problem and get it diagnosed. A proper treatment can the​​n be started. Di​​scuss the situation and hope it will be cleared in​​ few days. Don't delay the appointment. There is no way to confirm it with accuracy over a teledermatology forum.