Skin Perfecting 2% BHA Liquid Exfoliant

Both contain salicylic acid, but the concentration here is unknown and it's built around succinic acid and sulfur rather than being a straightforward 2% BHA formula.

Shares salicylic acid but this is primarily a multi-acid glycolic/lactic peel with retinyl palmitate added, quite different from the single-active 2% BHA liquid.

Shares salicylic acid but is dominated by glycolic, lactic, and mandelic acids plus retinol, making it a multi-acid/retinol peel rather than a BHA exfoliant.

This is a strong AHA (30% glycolic acid) peel with only a small amount of salicylic acid, whereas Paula's Choice is a pure 2% BHA leave-on exfoliant with no AHA at all.

This is a rice-based enzyme powder cleanser with papain and some salicylic acid, entirely different mechanism and format from a liquid BHA exfoliant.