I did one liver flush, got no stones, and it didn't really help. But I've read that whenever you have any Acne that's always a sign that your liver is either overworked or not in perfect shape. I would consider a "real" liver cleanse. 30-days on liver-health promoting herbs, like milk thistle and dandelion.
Just a few days ago I started a parasite cleanse (humaworm.com)- this is supposed to get rid of parasites and candida :D But so far the cleanse itself is helping with my pimples (I haven't had a single one since I started). I think this has a lot to do with the blood-purifying herbs in the pills. The liver isn't working so hard to clean the blood.
So... I don't have much proof that anything really works (lol) except a good diet. But even a perfect diet won't fix it for good. So yeah... consider doing the cleansing. It def. won't hurt to try.