Benzoyl peroxide Explained

BPO

Benzoyl peroxide is one of the two best-proven acne ingredients; stronger is not better, and less irritation matters on brown skin, where irritation leaves marks.

Evidence: strong

Label names (INCI): Benzoyl Peroxide

Written by the Oliareen editorial teamDermatologist review: pendingHow we write

What it does

Kills acne bacteria and loosens clogged pores; bacteria do not become resistant to it.

Often discussed for

This doesn't mean everyone with these needs it.

Concerns

Acne

Skin types

How to approach it

If you're new to it

Start one new product at a time and patch test first: a little on the side of the jaw for a few days. Keep the rest of the routine simple.

General education, not a diagnosis or treatment plan.

Works well with

Examples of common pairings, not guaranteed combinations.

Use carefully with

Stacking several actives raises the risk of irritation. If you're on any prescribed medicine, ask your doctor before adding an active.

Tretinoin (at the same time)
Bleaches towels, clothes and hair
Dryness and peeling
Stronger is not better; follow the product's or doctor's directions

Possible reactions

Stop if burning doesn't settle, or if you get a red rash, itching, swelling or peeling. Swelling of the face, lips or eyes, or trouble breathing, needs urgent medical care.

When to see a doctor

Evidence and timing

Evidence: Evidence: strong
Time to see a change (weeks): 8-12

Evidence comes from studies of specific formulas and strengths. Your product may behave differently.