I can't believe this hasn't been mentioned. Cutting out ALL dairy has not only cut down 90% of my oily skin, but also reduced a lot of my acne. It is tough. There are alternatives like coconut milk, almond butter, etc. I do miss cheese and ice cream the most. However, it's worth it to me in the end.
Also, been taking about 16,000 iU of Vitamin A daily. Eliminating dairy did more than the Vitamin A in my opinion.