THIERRY BERROD, MONA LISA PRODUCTION / SCIENCE PHOTO LIBRARY THIERRY BERROD, MONA LISA PRODUCTION / SCIENCE PHOTO LIBRARY
Propionibacterium bacteria, illustration. These are an example of non-pathogenic bacteria found on human skin, where they are well adapted to the natural acidity. An example is Propionibacterium acnes, found in the hair follicles and pores of the skin, where usually it causes no problems. However, if there is an over-production of sebum (sebaceous oil), the bacteria proliferate, producing enzymes that damage the skin and cause acne.
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