Salicylic Acid Explained

BHA · Beta hydroxy acid · LHA · Betaine salicylate

Salicylic acid is a beta hydroxy acid (BHA) that helps clear oil and dead cells inside pores; it's used for clogged pores and some acne concerns. Evidence varies by formula and concern.

Evidence: moderate

Label names (INCI): Salicylic Acid, Betaine Salicylate, Capryloyl Salicylic Acid

Written by the Oliareen editorial teamDermatologist review: pendingLast updated: 6 November 2026How we write

Myth vs fact

Myth: Oily skin automatically needs salicylic acid.
Fact: No. Having oily skin doesn't mean you need an exfoliant. It can help with blackheads and clogged pores, but overuse can dry and irritate skin.

What it is

Salicylic acid dissolves in oil, so it can get into oily pores. In skincare, 'BHA' almost always means salicylic acid. Labels may say Salicylic Acid, Betaine Salicylate or Capryloyl Salicylic Acid (LHA).

What it does

It loosens dead cells and oil inside pores, so blackheads and small bumps may look better, and it can calm some redness. The American Academy of Dermatology's 2024 guideline gives it only a conditional recommendation for acne; benzoyl peroxide and retinoids have stronger evidence. Painful or scarring acne needs a doctor.

Often discussed for

This doesn't mean everyone with these needs it.

Concerns

Skin types

How to approach it

It comes in cleansers and leave-on products. Many people start a few times a week and build up only if skin is comfortable. The whole formula and your skin's tolerance matter more than the percentage. Follow the product's directions.

Morning or evening

Morning or evening both work. It's best not to layer it with a retinoid, an AHA or benzoyl peroxide in the same session. Wear sunscreen by day.

If you're new to it

Start one new active at a time and give it at least two to four weeks before adding another. Patch test first: a little on the side of the jaw or behind the ear for a few days. Keep the rest of the routine simple: a gentle cleanser, a moisturiser and sunscreen by day.

General education, not a diagnosis or treatment plan.

Works well with

Examples of common pairings, not guaranteed combinations.

Use carefully with

Stacking several actives raises the risk of irritation. If you're on any prescribed medicine, ask your doctor before adding an active.

AHA (in the same session)
Retinoids (in the same session)
Benzoyl peroxide (in the same session)
Dryness and peeling
Salicylate allergy
Pregnancy: low-% leave-on (<=2%) acceptable, avoid peels
Mild photosensitivity — use SPF

Possible reactions

A few seconds of mild tingling or a little dryness can happen at first. Stop if burning doesn't settle, or if a red rash, itching, swelling or peeling keeps getting worse. Swelling of the face, lips or eyes, or trouble breathing, needs urgent medical care.

When to see a doctor

Evidence and timing

Evidence: Evidence: moderate
Time to see a change (weeks): 2-6

AAD 2024 gives salicylic acid only a conditional recommendation for acne (BPO and topical retinoids: strong).

Evidence comes from studies of specific formulas and strengths. Your product may behave differently.

Questions people ask

Is BHA the same as salicylic acid?

In skincare, almost always yes. BHA is a family name, and salicylic acid is the main member used in cosmetics, so we keep everything on this one page.

Can I use it every day?

Some skin tolerates daily use; for many people a few times a week is enough. If skin feels tight, peels or stings, cut back.

Does it fix acne scars?

No. It works on clogged pores, not on pitted scars. Our mark-vs-scar guide explains the difference.

Is it okay in pregnancy?

Low-strength leave-on products are generally considered acceptable, but avoid peels. Check with your doctor before starting any active in pregnancy.