Salicylic acid vs benzoyl peroxide is a common choice at the pharmacy shelf. Both are sold without a prescription and both have decades of use behind them. They work in different ways, so the better one for you depends on the kind of spots you get.
How each ingredient works
Salicylic acid
Salicylic acid is a beta hydroxy acid. It dissolves in oil, which lets it move into the pore and loosen the mix of oil and dead cells that causes a blockage. It also has a mild calming effect on the skin.
Benzoyl peroxide
Benzoyl peroxide releases oxygen in the pore, which reduces the bacteria involved in inflamed acne. It also helps to clear blocked pores to some degree. Bacteria do not become resistant to it, which is why doctors often pair it with other treatments.
Side-by-side comparison
| Salicylic acid | Benzoyl peroxide | |
|---|---|---|
| Main action | Unclogs pores | Reduces acne bacteria |
| Suits best | Blackheads and whiteheads | Red, inflamed pimples |
| Usual strengths | 0.5% to 2% | 2.5% to 10% |
| Common forms | Cleansers, toners, gels, pads | Washes, gels, creams |
| Common side effects | Dryness, mild stinging | Dryness, redness, peeling |
| Special caution | Can irritate if overused | Bleaches fabric and hair |
Which one should you choose?
- Mostly blackheads, whiteheads and rough texture: start with salicylic acid.
- Mostly red pimples with a white head: start with benzoyl peroxide.
- A mixture of both: either can work. Many people choose a benzoyl peroxide wash and a leave-on salicylic acid product, used at different times of day.
- Dry or sensitive skin: begin with the lowest strength and a wash-off form, which stays on the skin for less time.
Blackheads vs Whiteheads: What's the Difference? explains the difference between the types of clogged pore.
Strength is not everything
With benzoyl peroxide, a lower strength such as 2.5% often works about as well as a higher one and is less likely to irritate. More is not better. The same is true of using a product more often than the label says.
How to use them
- Patch test a new product first. See How to Add New Products to Your Skincare Routine.
- Apply a thin layer to the whole breakout-prone area on clean, dry skin.
- Begin every other day and increase to daily use if your skin stays comfortable.
- Follow with a light moisturizer.
- Use sunscreen in the morning.
Wash your hands after applying benzoyl peroxide, and use white towels and pillowcases, because it can bleach colored fabric.
Using both together
You can use both, but not all at once at the start. A cautious plan is to use one in the morning and the other in the evening, or to alternate days. If your skin becomes red, tight or flaky, reduce how often you apply them and add more moisturizer.
Who should take extra care
- People with very dry skin, eczema or rosacea.
- Anyone who is pregnant or breastfeeding should check with a doctor or pharmacist before starting an acne treatment.
- A small number of people are allergic to benzoyl peroxide. Stop and seek medical help if you develop swelling, hives or trouble breathing.
How long to wait
Give your chosen product six to eight weeks of regular use. A short period of extra dryness is common at first. Skin Purging vs Irritation: Signs to Look For helps you tell a normal adjustment from irritation. If you see no change after two to three months, ask a dermatologist about other options. You can read more about each ingredient in the Skincare Ingredient Checker.
Related on ArniSun
- Skincare Routine for Acne-Prone Skin
- Blackheads vs Whiteheads: What's the Difference?
- Skin Purging vs Irritation: Signs to Look For
- How to Add New Products to Your Skincare Routine
- Skincare Ingredient Checker: Look Up Ingredient Information
Sources and further reading
Frequently asked questions
Can I use salicylic acid and benzoyl peroxide on the same day?
Yes, once your skin tolerates each one alone. Use them at different times of day, and cut back if you notice dryness or redness.
Which works faster on a single pimple?
Benzoyl peroxide usually acts faster on a red, inflamed pimple. Salicylic acid is better at preventing the clogged pores that lead to pimples.
Are there people who should avoid salicylic acid?
People who are allergic to aspirin or other salicylates should avoid it, and it should not be used over large areas of the body for long periods without medical advice.