Ah the perverbial constipation problem. Many suffer from similar ailments (self included). It can easily be tied to colon issues.....the skin is sometimes called the third kidney since it's a filter and Acne is the skin's way of filtering inpurities out of the body. Of course, there can be other contributing factors. Check out this url here on the curezone: //www.curezone.org/cleanse/bowel/default.asp.
It has a ton of information on bowel cleansing. I've used several methods to help: master cleanse shakes (w/ Bentonite clay), psyllium, Nature's Sunshine LBS II formula, Triphala (gentle laxative that creates no dependencies). I have also heard that taking olive oil or flax seed oil daily can help with regularity but I haven't tried that consistently yet.
Diet plays a major role so try to stay away from the 4 main foods that slow down the bowels: chocolate, cheese, black pepper and peanuts (or peanut derivities). An apple or two a day can help also.