Hello,
Without examination, confirmation of a diagnosis is tough but it can be pityriasis versicolor or pityriasis alba. Pityriasis versicolor is caused by an overgrowth of a yeast fungus and are found mainly on sun
hypopigmented dermatitis.This is a self-limited disorder that usually resolves by adulthood. Severe cases may benefit by Psoralen plus ultraviolet light A photochemotherapy (PUVA).
I hope it helps. Take care and please do keep me posted on how you are doing or if you have any additional doubts. Kind regards.