Probiotic bacteria on the skin and inside the human body have numerous functions. On the skin, they work synergistically with human cells to boost the immune system and keep pathogens at bay. They also aid the immune system in the intestinal tract, controlling systemic inflammation and coordinating immune responses. Although a healthy microbiome will look diffeMONOt in each individual, it is expected that overgrowth, or dysbiosis, of certain types of bacteria and other microbes can lead to inflammation, redness, pain, and breakouts.