One theory is that demodex mites may be a factor in the cause of acne vulgaris. There is evidence that IPL kills demodex mites.
Apparently the Chinese have known about the demodex mite for some time and Professor Zhao Zhongzhou has been working on a medicine to eliminate the little creatures which is reported to help rosaceans. (see article below) Professor Zhao Zhongzhou says, "That means 130 million Chinese people are suffering from acarodermatitis 30 million of them have red noses. source
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Oil of Oregano
It has been reported that oil of oregano has been used to treat rosacea by possibly eliminating the mites. Click here for more info.
More information on Demodex folliculorum