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Salicylic acid is the ingredient for bumpy, congested skin. Because it dissolves in oil rather than water, it can travel down into an oily pore and break up what is stuck there. Other acids sit on the surface. This one goes in.
What it is oversold for is serious acne. If you have deep, painful cysts, salicylic acid is not going to fix them and no strength you can buy will change that. It also matters enormously whether the product stays on your skin or goes down the drain. A 2% leave-on liquid does far more than a 2% face wash, and most people who say salicylic acid did nothing were using a cleanser.
— Dr. Schwarz, Board Certified Dermatologist
Key Facts
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| Also called | BHA, beta hydroxy acid, salicylate |
| Type | Exfoliating acid, oil-soluble |
| Strengths sold | 0.5% to 2% over the counter |
| Use | Morning or night |
| Time to work | 2 to 4 weeks |
| Prescription needed | No |
What It Is
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Salicylic acid is a beta hydroxy acid, or BHA. It is chemically related to the compound found in willow bark, and to aspirin, though the version in skincare is made in a lab. In the United States it is regulated as an over-the-counter acne drug at 0.5% to 2%. Dermatologists also use it at much higher strengths, 20% to 30%, for in-office chemical peels. You will also see it in wart removers at 17% to 40%. That is a completely different use and those products must never go on the face.
How It Works
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Salicylic acid loosens the glue that holds dead skin cells together, so they shed instead of piling up. Its useful trick is that it dissolves in oil. A pore filled with sebum will let salicylic acid in, and once inside it breaks down the plug of cells and oil that forms a blackhead or whitehead. Water-soluble acids such as glycolic acid cannot do this. Salicylic acid is also mildly anti-inflammatory, which takes some of the redness out of active spots. The part people get wrong is contact time. Salicylic acid needs to sit on the skin to work. In a cleanser it is on your face for perhaps 30 seconds before it is rinsed away, which is why washes are far weaker in practice than their percentage suggests. A leave-on toner, serum or lotion at the same 2% does considerably more. The other misunderstanding is what it treats. It clears and prevents clogs. It does not kill acne bacteria the way benzoyl peroxide does, and it does not reprogram how skin cells behave the way a retinoid does.
What It Treats
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Each grade is the same one shown on that condition’s page.
Forms and Strengths
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Cleanser: rinsed off. Gentle, easy to add to a routine, but the weakest option because contact time is so short. Reasonable for oily backs and chests. Leave-on liquid, toner or serum: applied and left on. This is the form with the most effect for the least product. Cream and lotion: leave-on, in a more moisturizing base. Better for drier skin. Medicated pads and wipes: convenient and popular, but the alcohol many of them contain does more drying than the acid does. Spot treatment: a dab on individual spots. Fine, but it will not stop new ones. Body spray and body wash: made for chest, back and shoulders, and for the rough bumps of keratosis pilaris on the arms. On the label, look for the Drug Facts panel listing "Salicylic Acid" with a percentage.
0.5% to 1% suits sensitive or dry skin and is a sensible starting point. 2% is the maximum sold over the counter for acne and the strength most studied. It is the standard choice for oily, congested skin. There is little to gain from chasing the highest number. Going from 1% to 2% is a modest increase in effect and a real increase in dryness. Whether the product is left on the skin matters more than the percentage does. The pH of the product also affects how well it works, but this is almost never on the label, so it is not something you can shop by. Anything above 2% for the face is a professional peel, not a home product.
How to Use It
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Where it sits in a routine: After cleansing, before moisturizer. A leave-on liquid goes on with a cotton pad or clean fingers across the whole area, not spot by spot. If you use a retinoid at night, put salicylic acid in the morning routine and the retinoid at night. Using both at once is a common cause of raw, stinging skin.
How to start: Start three times a week with a 2% leave-on product, or daily with a 0.5% one. Build to daily over two to three weeks if your skin is comfortable. Moisturize afterwards. Sunscreen in the morning. Do not use it on the same day as a scrub, a peel pad or another acid. If you are using it for blackheads on the nose, be patient. Existing blackheads soften and clear over several weeks. They do not lift out overnight.
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What to Expect
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What to Pair With
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- Benzoyl peroxide covers what salicylic acid does not, which is the bacteria driving inflamed spots. Use them at different times of day.
- Niacinamide calms the irritation that acids cause and supports the skin barrier. It also helps with the dark marks left behind. Layers well with no fuss.
- A plain moisturizer reduces the flaking that makes people give up.
- Sunscreen exfoliated skin burns more easily and marks more readily.
- Adapalene, on alternate days or split between morning and night: for congested skin that has not responded to salicylic acid alone, this is the logical next step.
What Not to Mix
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- Other exfoliants in the same application glycolic acid, lactic acid, scrubs, cleansing brushes and peel pads. Stacking exfoliants is the most common self-inflicted skin injury in acne care. Pick one method.
- Retinoids at the same time adapalene, tretinoin and retinol all exfoliate too. Separate them by time of day or by day.
- High-strength vitamin C in the same application: not dangerous, but both are acidic and the combination stings on many faces. Easy to avoid by splitting them.
- Wart or callus removers on the face these contain 17% or more salicylic acid and will burn facial skin. They are not a stronger version of an acne product.
- The folklore you do not need to "wait 30 minutes" before your next step, and salicylic acid does not thin your skin permanently. Over-exfoliation damages the barrier, but it recovers once you stop.
Side Effects
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Well tolerated for most people at over-the-counter strengths. Problems usually come from using too much, too often.
Common — expected, and they settle
- Dryness, flaking, tightness and mild stinging on application. Slight redness. These settle within a couple of weeks or when you cut back the frequency.
Tell your doctor — worth a call, not an emergency
- Persistent burning, redness that spreads, or skin that feels raw and sensitive to everything. Worsening acne after eight weeks. New dark patches where the skin was irritated.
Stop and get care
- Hives, swelling of the face or throat, or difficulty breathing, which suggests an allergy. Also stop and seek advice if you develop ringing in the ears, dizziness, nausea, headache or confusion after applying salicylic acid over large areas of the body. This is salicylate toxicity. It is very rare and is linked to high-strength products used on large areas, particularly in children and in people with kidney or liver problems.
If You Stop
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Pores start clogging again. Salicylic acid clears out what is there and keeps new plugs from settling in, but it does nothing to how much oil you make or how fast your skin sheds cells on its own. Blackheads and bumps generally return over four to eight weeks. There is no rebound. Skin goes back to its usual state rather than a worse one. Any smoothness you gained is surface-level and fades within days to weeks. This is a maintenance ingredient, used a few times a week indefinitely by many people.
Who Should Avoid It
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Do not use
- Anyone with an allergy to salicylates or aspirin.
- Children under two, and anyone using it over large areas of the body who has kidney or liver disease, because of the small risk of absorbing too much.
- Skin that is broken, sunburned, cracked or in an active eczema flare.
- Do not use it around the eyes, on the lips, or inside the nose.
Use with care
- Pregnancy Low-strength topical use on the face is generally considered acceptable during pregnancy and breastfeeding, but check with the doctor managing your pregnancy. Avoid high-strength peels and avoid applying it over large areas of the body. Azelaic acid is the usual alternative.
- Other conditions Eczema, rosacea and sensitive skin all mean lower strength and less often. Kidney or liver disease matters only if you are treating large areas of skin, where absorption is higher. In brown and black skin, over-exfoliation can leave dark marks that take months to fade.
- Other medicines Anything else that exfoliates, including retinoids, other acids and prescription acne treatments, adds to the irritation. Space them out. Keep high-strength wart removers well away from the face and from any product routine.
FAQ
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Does salicylic acid actually get rid of blackheads?
Partly. It softens and clears the plug over several weeks, and it stops new ones forming. What you may be left with is the visible pore opening, which stays the size it is. Nothing sold over the counter shrinks pores permanently.
Is a salicylic acid face wash enough?
Usually not. It is on your skin for seconds before it is rinsed off. If you have tried a wash and seen nothing, try a leave-on product at the same percentage before deciding the ingredient does not work for you.
Can I use it every day?
Many people can, at 0.5% to 2%. Build up rather than starting there. If your skin is flaking or stinging, three times a week is doing more good than daily use that damages the barrier.
Is salicylic acid safe in pregnancy?
Topical products at over-the-counter strengths on the face are generally considered acceptable, but confirm with the doctor managing your pregnancy. High-strength peels and use over large areas of the body are avoided. Azelaic acid is the usual alternative.
Salicylic acid or benzoyl peroxide?
Depends on what you have. Blackheads, whiteheads and rough texture point to salicylic acid. Red, sore, inflamed spots point to benzoyl peroxide. Most people have both, which is why the two are often used together at different times of day.