Salicylic acid is a beta hydroxy acid (BHA) found in cleansers, toners and spot products for blackheads, whiteheads and breakouts. It loosens the links between dead skin cells so clogged pores clear more easily. In a small study, a 2% cleanser reduced blackheads and whiteheads within two weeks, where a benzoyl peroxide wash did not.
- Helps with
- blackheads, whiteheads, breakouts, oily skin, rough texture
- Evidence
- Moderate. Long clinical use and peel studies across skin types; the head-to-head cleanser trial is small (30 people).
- Typical strength
- 2% in the cleanser study; clinic peels use much higher strengths
- Works well with
- oil-free moisturizer, daily sunscreen
- Be careful with
- other exfoliating acids on the same night, large areas at high strength
What does salicylic acid do for skin?
Salicylic acid is the clogged-pore ingredient. Think of the dark dots across the nose, the small flesh-colored bumps on the forehead that never come to a head, and the breakouts that follow. Those are blackheads, closed comedones and the spots they turn into.
A review of salicylic acid peels sums up why it is used: “the comedolytic property of salicylic acid makes it a useful peeling agent for patients with acne.” Comedolytic simply means it helps break up blackheads and whiteheads.
How does salicylic acid unclog pores?
Dead skin cells are held together by small connections, a bit like rivets. Salicylic acid loosens those connections rather than dissolving the cells themselves, so the cells stuck in and around a pore let go more easily. That is why it is described as exfoliating: the surface sheds, and the plug in the pore loosens with it. People have used it on skin for more than 2,000 years.
Is a salicylic acid cleanser enough?
For blackheads and whiteheads, it can make a difference. In a 4-week crossover study of 30 people with breakouts, a cleanser with 2% salicylic acid was compared with a 10% benzoyl peroxide wash. Only the salicylic acid cleanser significantly reduced blackheads and whiteheads. People who used it for the first 2 weeks improved, then got worse after switching to the benzoyl peroxide wash, while those who started with benzoyl peroxide kept improving after switching to salicylic acid.
Does salicylic acid shrink pores?
The evidence here is thin. A 2023 study found fewer breakouts and smaller-looking pores after 4 clinic peels with 30% salicylic acid followed by 3 laser sessions, but because the treatments were combined, the result cannot be credited to salicylic acid alone.
How long until you notice a difference?
In the cleanser study, change in blackheads and whiteheads showed within 2 weeks.
How do you use salicylic acid?
As a cleanser, the form used in the study above, or as a leave-on toner or spot product in the evening, followed by a light moisturizer. Use one exfoliating acid at a time; it sits in the same family as glycolic acid and lactic acid.
Who should be careful with salicylic acid?
Strong peels belong in a clinic. The peel review describes salicylism, a whole-body reaction that can happen when too much salicylic acid is absorbed, which is why high-strength products are not for large areas at home. Its peels have been used safely across light and dark skin types in published studies. If your skin is dry or reactive, patch test first.
- How to get rid of bumps on arms: keratosis pilaris care
- How to introduce new skincare product by product
- A skincare routine for hormonal breakouts, kept minimal
- How to exfoliate body skin without irritation
- What is skin cycling, and does the schedule help?
- How to get rid of strawberry legs, by cause
- How to use toner pads without overdoing it
- How to oil cleanse properly, step by step
- The bump only I could see
- What are closed comedones? A cosmetic guide
- Arif T. Salicylic acid as a peeling agent: a comprehensive review. Clin Cosmet Investig Dermatol. 2015;8:455-61.
- Shalita AR. Comparison of a salicylic acid cleanser and a benzoyl peroxide wash in the treatment of acne vulgaris. Clin Ther. 1989;11(2):264-7.
- Kornhauser A, Coelho SG, Hearing VJ. Applications of hydroxy acids: classification, mechanisms, and photoactivity. Clin Cosmet Investig Dermatol. 2010;3:135-42.
- Han Q, et al. Evaluation of 30% supramolecular salicylic acid followed by 1565-nm non-ablative fractional laser on facial acne and subsequent enlarged pores. Lasers Med Sci. 2023;38(1):91.
Editorial content, not medical advice.