A leave-on 2% salicylic acid liquid. Because it stays on the skin, it does considerably more than a salicylic acid cleanser.
Texture — Lightweight, watery liquid
Key Active — Salicylic acid 2%
Best For — Oily, acne-prone, clogged pores, blackheads
Price Tier — $$
The difference between this and a salicylic acid cleanser comes down to contact time. A cleanser is on your face for 30 seconds. This stays on. That's why it does far more.
Salicylic acid's advantage over other acids is that it's oil-soluble — it dissolves in oil, so it can travel down into a clogged, oily pore and break up the plug from inside. Glycolic acid and other AHAs are water-soluble and only work on the skin's surface, which is why they're better for tone and texture than for acne.
It's also anti-inflammatory — chemically related to aspirin — so it calms angry, red pimples as well as unclogging.
The formula itself is well made: no fragrance, no denatured alcohol, and green tea to offset irritation. It's earned its reputation.
Don't use it daily at first. Two to three times a week is plenty. Daily use is the fastest way to strip your barrier — and over-exfoliating is the single most common self-inflicted skin problem.
Don't stack it with a retinoid on the same night until your skin is well adapted. Alternate nights.
It's pricier than it needs to be. The formula is good, but there are cheaper 2% BHA options that perform similarly.