1. resident bacteria in the skin, competing for space and resources so that the bad pathogenic bacteria can't live there and infect you
2. skin sloughing off each day gets rid of the current batches of bacteria so that they don't have too much time to grow and mutate on you
3. little bit of oil secretions on your skin is toxic to most bacteria.
4. dry skin is less hospitable to bacteria (i.e. you have more bacteria in your armpits and groin where it's moist than on your arms and legs)
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