I am male aged 25 years. I am suffering from pseudo acanthosis nigricans from the age of 13 due to over weight. But at present I have a healthy weight and my insulin level is normal. Usually the skin on my face is too oily which makes me look black in colour. The skin on my face is too black compared to colour of my inner body. What is the reason for too much oil on my face? How to make the skin of my face clean and ever glowing?