What is the difference?
| What matters | Salicylic acid | Glycolic acid |
|---|---|---|
| Ingredient family | Commonly called a beta hydroxy acid, or BHA | An alpha hydroxy acid, or AHA |
| What it does | Removes dead skin and penetrates oily pore openings | Exfoliates skin and helps clear pores |
| Best reason to choose it | Blackheads and whiteheads are the main concern | Clogged pores come with surface texture concerns or fine lines |
| Irritation | Can be less irritating than AHAs, but still causes dryness or irritation | Can cause irritation and sun sensitivity |
| Starting frequency | Use less often initially if needed, within the label directions | Start every other day, within the label directions |
For sensitive skin with blackheads, salicylic acid is a reasonable first choice, not a reason to skip testing. Glycolic acid can also help with hydration and fine wrinkles. Choose by the problem you want to treat, rather than giving every acid on the shelf a position in your routine.23
Are the clogged pores blackheads or whiteheads?
Both form when pores clog with excess oil, bacteria and dead skin cells. A closed pore produces a white or flesh colored bump; an open clogged pore produces a blackhead. Scrubbing can worsen acne.5
How should you start?
- 1Choose one product. For blackheads and whiteheads, start with a salicylic acid acne product. Follow its label for strength, skin preparation, application and whether to rinse it off.
- 2Test salicylic acid on one or two small affected areas for three days. If there is no reaction or discomfort, use it as directed.
- 3Start gradually. Salicylic acid can be used less often initially while skin adjusts. For glycolic acid, start every other day; general AHA guidance gives a starting maximum concentration of 10% to 15%, not a requirement to choose the strongest option.
- 4For an acne medication left on the skin, apply a thin layer across the affected acne prone area rather than only visible spots. Do not exceed the label frequency. Apply sunscreen every morning with either acid.
Should you use both acids?
Not as your starting plan. Give one acne product six to eight weeks without adding another treatment. With salicylic acid, avoid abrasive cleansers, alcohol containing skincare and other topical medicines such as benzoyl peroxide or tretinoin on the same area unless your doctor directs you to combine them. These combinations can cause substantial irritation.14
How long before pores look clearer?
Salicylic acid takes several weeks or longer for its full benefit. With effective acne treatment, fewer breakouts can appear in four to eight weeks, with clearing around 16 weeks. These are general acne treatment timelines, not a separate timetable for glycolic acid. If blackheads or whiteheads persist after six to eight weeks, a dermatologist can consider a retinoid, prescription treatment or professional extraction.145
When should you stop or get help?
Do not apply salicylic acid to broken, red, swollen, irritated or infected skin. Stop for irritation or prolonged stinging and contact a doctor. Stop and seek emergency help for breathing difficulty, throat tightness, faintness or facial swelling. If pregnant or trying to conceive, consult a dermatologist before treating acne yourself; discuss salicylic acid use while breastfeeding too. Deep painful spots or acne that scars need a dermatologist rather than another exfoliant.134
Professional glycolic and salicylic acid peels are a different decision from everyday skincare. Peels can improve acne, but can also cause blocked pores and pigment changes afterward, with greater pigment and scarring risks in darker skin. Discuss those risks with the practitioner before booking.6
Where this answer comes from
- 1Adult acne treatment dermatologists recommendaad.org
- 2Popular Skin Care Ingredients Explainedhealth.clevelandclinic.org
- 3Beta Hydroxy Acidsfda.gov
- 4Salicylic Acid Topical: MedlinePlus Drug Informationmedlineplus.gov
- 5How to treat different types of acneaad.org
- 6Chemical peels (face peels)dermnetnz.org
