I've heard the oil washes oil theories, and overdrying increases oil theories, too. I use a moisturizer (with my bp) because I find it makes a huge difference in preventing irritation. I think sometimes the over-drying leads to irritation which leads to either red irritated/uneven skin tone, or it aggravates breakouts. My take on it, anyway. Kita That's true.  Inflamed skin doesn't help breakouts. It's interesting that you use a moisturizer with benzoyl peroxide. Galderma has done something similiar with their Benzac AC gel in contrast to their Benzac W gel:   Benzac(R) AC incorporates acrylates copolymer technology to deliver moisturizing glycerin to dry, sensitive skin and absorb excess facial sebum.   <http://www.galdermausa.com/products/acne.php   <http://www.galdermausa.com/products/benzac.php

I'm willing to bet that the moisturizer you are currently using is not formulated for oily skin or has some overly emoilliant ingredient. If you do discontinue to use it, chances are it will help. BUT if you are using anything at all to help the acne/oil, than you need something to prevent transepidermal water loss- basically, dehydration of the skin. That doesn't mean you will be retaining more oil, you will just be maintaining the neccessary water moisture needed in healthy skin. An esthetician  

I'm willing to bet that the moisturizer you are currently using is not formulated for oily skin or has some overly emoilliant ingredient. If you do discontinue to use it, chances are it will help. BUT if you are using anything at all to help the acne/oil, than you need something to prevent transepidermal water loss- basically, dehydration of the skin. That doesn't mean you will be retaining more oil, you will just be maintaining the neccessary water moisture needed in healthy skin. An esthetician And what is that something..