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Benzoyl peroxide

Written by the Fiveable Content Team • Last updated September 2025
Written by the Fiveable Content Team • Last updated September 2025

Definition

Benzoyl peroxide is an antimicrobial agent commonly used in the treatment of acne. It works by killing bacteria on the skin and reducing inflammation.

5 Must Know Facts For Your Next Test

  1. Benzoyl peroxide is effective against Propionibacterium acnes, a bacterium involved in acne formation.
  2. It has both antibacterial and keratolytic properties, helping to clear clogged pores.
  3. Benzoyl peroxide can cause skin irritation and dryness as side effects.
  4. Over-the-counter products typically contain 2.5% to 10% benzoyl peroxide.
  5. Long-term use of benzoyl peroxide does not lead to antibiotic resistance in bacteria.

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