Salicylic acid vs benzoyl peroxide: what the experts say

The experts we track back both, and they use them for different jobs. Salicylic acid unclogs pores, so it is the pick for blackheads and whiteheads. Benzoyl peroxide kills the bacteria behind red, inflamed pimples. Benzoyl peroxide has a Guru Score of 100% and salicylic acid sits just behind at above 90%, so the real question is which kind of acne you have.

Below is how the two differ, how the experts in both our guides rated them, which they point to for each kind of breakout, and what to know about dryness, benzene and pregnancy.

What is the difference between salicylic acid and benzoyl peroxide?

They work in different ways. Salicylic acid is an exfoliating acid, often called a BHA. It loosens the dead skin cells that build up into a plug, and because it mixes with oil it can follow sebum down into the pore (Arif, 2015; Kornhauser and colleagues). That plug of dead cells and oil is what a blackhead or whitehead is.

Benzoyl peroxide is an antiseptic. It cuts down the bacteria on the skin linked to inflamed acne, has a mild unclogging effect, and bacteria do not become resistant to it (DermNet). Dr. Vanita Rattan, a doctor, puts it simply: “The way benzoyl peroxide works is it kills P. acnes bacteria with oxygen.”

Dr Dray, a dermatologist, uses both on the back and gives each its job. She explains that “Benzoyl peroxide helps reduce the acne-causing bacterium, Cutibacterium acnes,” and adds that “salicylic acid importantly helps to break up blackheads and whiteheads.”

Both are over-the-counter acne medicines in the US: salicylic acid at 0.5% to 2% and benzoyl peroxide at 2.5% to 10% (US acne rules).

Which do the experts rate higher, salicylic acid or benzoyl peroxide?

Benzoyl peroxide, by a little. It has a Guru Score of 100% from about a dozen experts, with every one of them saying yes. Salicylic acid has a Guru Score above 90% from about a dozen experts, with one saying no.

All but one of the experts in both our guides said yes to both, and none of them rated salicylic acid higher. The exception is Cassandra Bankson, a medical esthetician, who said no to salicylic acid and yes to benzoyl peroxide. Her worry was doubling up acids: she warns against adding more salicylic acid on top of an AHA and BHA peel, because “you don't want to be using this and then use a Salicylic Acid cream or use a Salicylic Acid moisturizer and totally double up.”

Every verdict, with a link to the moment each expert gave it, is in our salicylic acid guide and benzoyl peroxide guide.

Is salicylic acid or benzoyl peroxide better for acne?

It depends on the kind of acne. The American Academy of Dermatology says salicylic acid works best on whiteheads and blackheads, while benzoyl peroxide is especially effective at treating mild pimples (AAD). Its 2024 acne guidelines give benzoyl peroxide a strong recommendation and salicylic acid a conditional one, a step below (Reynolds and colleagues). Even so, a 2013 review of 22 trials found some evidence that benzoyl peroxide reduces acne spots, but judged the trials too varied and too prone to bias for firm conclusions (Mohd Nor and Aziz), so it is a long-trusted treatment rather than one with a stack of modern head-to-head trials behind it.

The one direct comparison in our guides is small. In a four week study in 30 people with acne, only the 2% salicylic acid cleanser significantly reduced blackheads and whiteheads when compared with a 10% benzoyl peroxide wash (Shalita, 1989). It is an old and small study, so treat it as a hint rather than proof.

The experts split along the same line. The Budget Dermatologist, a dermatologist, calls salicylic acid “my absolute number one go-to for topical acid when it comes to treating acne,” but for acne overall she says: “The research and evidence shows that Benzoyl Peroxide is actually more effective than salicylic acid in treating acne, so that is why this is my first go-to after a retinoid.”

For oily, clogged skin, Dr. Aleksandra Brown, a dermatologist, suggests: “If your skin is really oily and you want to use something in the morning that will help degrease and remove the oils and clean out the pores, then consider cleansers with salicylic acid.” Doctorly, a channel run by two dermatologists, say that “Benzoyl peroxide is incredibly effective for your inflammatory types of acne,” and for blackheads and whiteheads they would go with a salicylic acid cleanser “probably over the benzoyl peroxide option.”

Which is gentler, salicylic acid or benzoyl peroxide?

Neither is gentle by default. Both can cause dryness and irritation, and US acne labels must warn that this is more likely if you use another acne medicine at the same time (US label rules). Dr. Vanita Rattan warns that “salicylic acid is a very drying product.”

Benzoyl peroxide has a couple of extra catches. Dr Dray warns that “if you've never used benzoyl peroxide it can be very drying, can be very irritating, so not all skin types are going to tolerate this.” Dr. Shereene Idriss, a dermatologist, says: “It can bleach your towels so be very careful if you have colored towels, and it can also dry your skin out.” Benzoyl peroxide bleaches hair and fabric (US label rules).

For benzoyl peroxide, a lower strength may be enough. In three 1986 studies in 153 people, a 2.5% gel reduced inflamed spots as well as 5% and 10% gels and caused less peeling, redness and burning than the 10% (Mills and colleagues), and the American Academy of Dermatology suggests starting with 2.5%.

If benzoyl peroxide is too much, salicylic acid is the usual swap. Dr. Jenny Liu, a dermatologist, says: “If you're allergic to benzoyl peroxide because some people can or benzoyl peroxide is just too irritating, then salicylic acid would be a good alternative.”

Can you use salicylic acid and benzoyl peroxide together?

Yes, many people do, but add one at a time. Two acne medicines together make dryness and irritation more likely (US label rules), so our guides suggest using them at different times of day or on alternate days rather than one straight on top of the other.

On the back and chest, a wash is the easy way in. The American Academy of Dermatology says a benzoyl peroxide wash works best left on for two to five minutes before rinsing (AAD), and rinsing it off spares your clothes.

Is benzoyl peroxide safe? What about the benzene news?

Benzoyl peroxide can break down into benzene, a chemical linked to cancer. When the US Food and Drug Administration (FDA) tested 95 benzoyl peroxide products, more than 90% had undetectable or extremely low levels, and six had elevated levels, which led to recalls. The FDA said the cancer risk from the benzene found in these products is very low, even with daily use for decades (FDA, 2025).

Heat matters, so the American Academy of Dermatology advises storing benzoyl peroxide products at room temperature or cooler, replacing them every 10 to 12 weeks, and throwing them out if they have been somewhere hot. If you would rather avoid it, the academy points to salicylic acid, among others (AAD statement).

Dr. Aleksandra Brown, a dermatologist, was not alarmed. She says benzoyl peroxide “still works, it's very effective and it releases very small amounts of benzene so I find it safe and I have continued to use it myself in the shower.”

Can you use salicylic acid or benzoyl peroxide while pregnant?

The medical sources are fairly reassuring about both, with limits, and our experts disagree. A 2023 review of acne treatment in pregnancy says topical salicylic acid is considered safe because so little is absorbed, as long as it is not applied over large areas for long periods or under a covering, and it lists topical benzoyl peroxide among the options for mild to moderate acne. The same review notes the data are sparse (Ly and colleagues). The NHS says benzoyl peroxide can usually be used in pregnancy, but it is best to check (NHS). Salicylic acid peels are a different matter, and a review of peels advises against them in pregnancy (Arif, 2015).

If you are pregnant, trying to be or breastfeeding, talk to your doctor or midwife before starting either one.