Here is some info I think should be read for people battling with skin trouble. I think if you are as aware of good bacteria as we are of "bad" bacteria, our approaches to healing will be more enlightened.
"Skin flora are usually non-pathogenic, and either commensals (are not harmful to their host) or mutualistic (offer a benefit). The benefits bacteria can offer include preventing transient pathogenic organisms from colonizing the skin surface, either by competing for nutrients, secreting chemicals against them, or stimulating the skin's immune system." - http://en.wikipedia.org/wiki/Skin_flora
"The harmless bacteria that thrive on the skin can help immune cells fight disease-causing microbes, according to a new study in mice. The finding gives new insight into skin health."