Acen doesn't have just one single cause, but a combiantion of them: hormonal imbalance, poor digestion, ineffcient liver activity mostly due to stones, intestinal and skin bacterira and yeast overgrowth, general toxicity, and low self-worth issues or resentments towards other or oneself.
The liver cleanse is definitely very important in that it helps all these other causes. Two liver cleanses, though , wont't be enough. Make sure to follow a protocol that includes colon cleanses before and after the flushes. Otherwise your body can become really toxic, which can affect your skin or prvent it from improving (see directions in The Amazing Liver Cleanse, ener-chi.com). Digestive problems can continue until the last stones have been removed from the liver bile ducts.
A pitta-pacifying (blood, liver and skin friendly) is important since Acne is a pitta disorder (see all details in my book The Key to Health and Rejuvenation, ener-chi.com).
One of the best herbs to use for Acne is burdock extract. It also balances hormones. Improvements usually begin to show up after 4-6 weeks.
Lastly, you may also benefit from reading Freedom from Judgment (ener-chi.com), to get in touch with the non-physical aspect of Acne.