Here's something that might make your skin crawl: Your skin is covered with trillions of itty bitty microbes.

But these microbes aren't all bad. In fact, most of them do more good than harm.

To learn more about what affects the bacteria in your body, otherwise known as your microbiome, Business Insider ventured to a recent exhibit on the microbiome at the American Museum of Natural History.

Here are 11 factors that influence the bacteria living in and on you: