Paula's ChoicePaula's Choice Skin Perfecting 2% Bha Liquid Exfoliant

BUY at Birchbox

You can think of BHA as salicylic acid's dapper nom de plume. (The two ingredients are one and the same.) Whatever you call it, BHA is a clinically proven blemish-buster with the added bonus of increasing collagen production for smoother skin. Not only that, but it's the powerhouse ingredient behind this nonirritating liquid. The formula works to calm redness and rosacea and is strong enough to dislodge the most stubborn blackheads and degrease pores down to their oiliest depths. While BHA is th