Hello,
From your symptoms two possibilities are coming to my mind. First possibility is of pityriasis versicolor and the second possibility is of vitiligo. Pityriasis versicolor versicolor is caused by a fungus that lives in the skin of almost all adults. Vitiligo is a pigmentation
appear on the skin in different parts of the body.
My sincere advice would be to get an evaluation done from a dermatologist. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.