Salicylic acid: uses, strength, evidence, and side effects

At a glance

U.S. status

OTC drug or prescription (U.S.)

Jobs

Blackheads and congestion · Mild acne · Oily skin · Keratosis pilaris

Watch for

Modest on its own. Cochrane found low-quality evidence for acne; it shines as a maintenance cleanser or for comedones, not for inflamed cysts.

Access

Inexpensive OTC in every price tier; concentration and pH matter more than brand.

Forms and strengths

0.5–2% cleansers, toners, and leave-ons (OTC drug for acne)
Higher strengths in peels and wart products (Rx or professional)

How to use it

Cleanser or leave-on once daily; 2% leave-on a few times a week if using a retinoid. Do not stack with other acids while adjusting.

Side effects and cautions

Dryness and tightness
Stinging
Mild peeling

Get advice first if

Aspirin allergy is a reason to avoid it. Large-area use of high strengths, especially in children, risks salicylate absorption. Increases sun sensitivity.

Regulatory status

OTC drug active for acne at 0.5–2% under FDA's monograph; also permitted as a cosmetic ingredient. FDA notes cosmetic BHA products should carry sun-protection advice.

In the trends

The 'exfoliate daily' era produced a wave of over-exfoliated barriers; the trends desk covers skin cycling as the correction.

Sources on file

These links support the claims above. Reviewed September 1, 2026. Drug labels link to DailyMed searches so the current label is always one click away.