Also known as: BHA, asam salisilat, betaine salicylate, Butylated Hydroxy Anisole, 25013-16-5, 69-72-7
An oil-soluble BHA that can travel into the pores and clear out what's clogging them.
Low-concentration rinse-off products are generally considered pregnancy-safe, but high-concentration leave-on products are best avoided — check with your doctor. 2-3 times a week is enough for most skin.
Salicylic acid is a lipid-soluble BHA that can penetrate into pores and shed the clogging dead skin cells. As a keratolytic it softens keratin and helps break down comedones, and it has an anti-inflammatory effect similar to aspirin.
📏 Effective concentration: 0.5-2% for at-home acne use, which is also the maximum strength allowed in the EU for consumer products. Professional peels use much higher concentrations (around 20-30%).
🤰 Pregnancy: Low-dose topical salicylic acid is generally considered low-risk, but it can be absorbed through the skin, so high-dose, oral, or peel use warrants caution and is best discussed with a doctor during pregnancy or breastfeeding. General information, not personal medical advice.
🔀 Interactions: Used together with a retinoid it can add dryness and irritation, so it is often alternated or balanced with enough moisturizer. For acne, salicylic acid is often paired with antibacterial agents like benzoyl peroxide.
General info from the literature, not personal medical advice. Actual product concentrations may differ.
Mandelic acid has a large molecule and slower penetration — still effective for acne & pores, but far friendlier for sensitive skin that can't tolerate salicylic acid.
A good match for oily, breakout-prone skin: salicylic acid clears pores from within, while niacinamide helps regulate sebum and soothe. Apply salicylic acid first, let it absorb, then niacinamide — start 2-3x a week if your skin is sensitive.
Azelaic acid and salicylic acid complement each other for managing breakouts, texture, and post-acne marks. To reduce irritation risk, many people use them at different times, e.g. azelaic in the morning and salicylic at night.
A classic acne combination, but very drying when used together every day. The fix: use them at different times (BHA in the morning, BPO at night) or on different areas, and balance things out with a ceramide-rich moisturizer.
Salicylic acid exfoliates inside the pore while sulfur absorbs oil and dries out breakouts, so they complement each other but risk over-drying at high concentrations. Start slowly, especially on dry or sensitive skin.
Salicylic acid clears pores while tea tree is antibacterial, but tea tree is more irritating so combining the two can trigger sensitivity. Dilute the tea tree, use it as a spot treatment, and start at low frequency.
Stacking BHA and retinol in one routine can leave skin dry and flaky. The fix: use them on different nights, or salicylic acid in the morning (still finished with sunscreen) and retinol at night.
AHA and BHA at once risks over-exfoliation: stinging, dryness, and redness. The fix: one type of exfoliant per routine, or alternate them on different nights, 2-3 times a week at most.
Vitamin C and salicylic acid (BHA) can be used close together, but both sit at a low pH and may trigger irritation on sensitive skin. Watch how your skin reacts, or separate them by time if stinging occurs.
They can be used together and complement each other, but both exfoliate so overusing them together risks over-exfoliation and dryness. Introduce gradually, or split the timing (e.g. salicylic in the morning, azelaic at night) and always moisturize.
Stacking an AHA and a BHA risks over-exfoliation even though mandelic acid is on the gentle side. The fix: alternate nights, at most one exfoliant per session.
An AHA and a BHA together risk over-exfoliation. The fix: pick just one exfoliant per night's routine.
Both are drying — stacked together they risk disrupting the skin barrier. The fix: cut back on one, or use them at different times.