Under some circumstances, is beneficial, but under other conditions the bacteria become overabundant leading to inflammation of hair follicles.

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Propionibacterium acnes is a bacterium that is normally present on the skin and can be beneficial by preventing colonization by harmful bacteria. However, when it becomes overabundant, it can lead to inflammation of hair follicles, contributing to acne.

Under Some Circumstances, Is Beneficial, but Under Other Conditions the Bacteria