I am 28 years old. On my left side of face 1 cm diameter faded white spot (not pure white) is present from last 3 years. Many doctors diagnosed it as pityriasis alba. I have also applied different types of cream on it as prescribed by doctors but it is not going away. My face is oily-combination type skin. Can you suggest me how do I care my face means what type of face wash is suitable for me and how I get rid of this spot?