Ingredient guide

BHA (salicylic acid): what it does and how to use it

Updated November 2026

Safety first: general cosmetic information, not medical advice. Patch-test new products and follow label directions. Pregnant, breastfeeding, using prescription skin treatment or managing a skin condition? Ask your doctor before trying new actives. Medical disclaimer
In short: An oil-soluble exfoliating acid that gets inside pores to clear out oil and debris. Best used at night, introduced slowly. Top benefit: clears blackheads and clogged pores.

An oil-soluble exfoliating acid that gets inside pores to clear out oil and debris. The go-to for blackheads and bumps.

Best timeNight
StrengthActive (go slow)
Good forClears blackheads and clogged pores

Benefits

Who it's for

Oily, combination and acne-prone skin.

How to use it

Use a 2% leave-on product a few evenings a week, or daily if your skin tolerates it. Apply after cleansing, before serums.

Watch out for

Can be drying. Avoid layering with other exfoliants in the same routine when you're starting out.

Best salicylic acid products

Cleanser$$
La Roche-Posay Effaclar Medicated Gel Cleanser

2% salicylic acid helps clear pores while you wash.

Salicylic acid
Check price on Amazon →
Serum$$
La Roche-Posay Pure Vitamin C10 Serum

Vitamin C with salicylic acid for glow and smoother texture.

Vitamin CSalicylic acid
Check price on Amazon →
Night treatment$$
Paula's Choice Skin Perfecting 2% BHA Liquid Exfoliant

Unclogs pores and smooths bumps. A true cult classic.

Salicylic acid
Check price on Amazon →

Can you mix salicylic acid with…

⚠️RetinolUse on alternate nights (or BHA in the morning)⚠️Vitamin CBetter at different times✅NiacinamideYes, generally fine together⚠️AHAsFine in one product, careful when layering⚠️Benzoyl peroxideWatch for dryness✅Hyaluronic acidYes, generally fine together⚠️Azelaic acidGo slow⚠️PeptidesUse at different times✅CeramidesYes, generally fine together✅SunscreenEssential✅Tranexamic acidYes, generally fine together✅BakuchiolYes, generally fine together✅Centella (cica)Yes, generally fine together✅SqualaneYes, generally fine together

Routines that use salicylic acid

Oily, Acne-Prone SkinDry, Acne-Prone SkinCombination, Acne-Prone SkinNormal, Acne-Prone Skin

Want a routine made for your skin?

Answer 7 quick questions and get a personalized morning and night routine. It's free and takes 60 seconds.

Take the free quiz →

FAQ

What does salicylic acid do for skin?

An oil-soluble exfoliating acid that gets inside pores to clear out oil and debris. The go-to for blackheads and bumps.

When should I use salicylic acid, morning or night?

Use a 2% leave-on product a few evenings a week, or daily if your skin tolerates it. Apply after cleansing, before serums.

Who should use salicylic acid?

Oily, combination and acne-prone skin.

This page is general cosmetic information for educational purposes. It is not medical advice, diagnosis or treatment, and it doesn't replace a dermatologist or other qualified professional. Product formulas change, so always read the label. Full medical disclaimer.