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Sebum has antibacterial properties due to sapienic acid and oleic acid according to this article on sebum. According to the same article, desaturation of fatty acids increases acne development. Another article, also suggests that the free fatty acids contribute to the antibacterial properties of sebum.

How does Propionibacterium acnes survive the antibacterial effects of sebum? Does it lack the enzymes to break down lipids in the sebum to form the antibacterial free fatty acids?

Also why are certain acne medications are so effective simply by inhibiting sebum production? Is sebum actually metabolic fuel for Propionibacterium acnes?

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  • $\begingroup$ Welcome to Biology.SE. The Biology.SE community has agreed that questions that show little or no prior research effort are off-topic on this site as are "homework" questions unless you have shown your attempt at an answer. Please edit your question and tell us where you've looked for answers, what you do know about the topic, and where exactly you still have questions. Under researched questions may be subject to down-voting and closure. Please take the tour and consult the help center starting with How to Ask for details. $\endgroup$
    – tyersome
    Sep 26, 2021 at 17:22
  • $\begingroup$ In particular, how do you know sebum has antibacterial properties — providing references supporting such statements will greatly improve your question. Also note that you seem to have multiple loosely related questions — please post each question separately as this makes it easier to index (and find) answers on the site and also greatly improves your chances of getting all your questions answered. $\endgroup$
    – tyersome
    Sep 26, 2021 at 17:25

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