Salicylic acid is a beta-hydroxy acid (BHA), which is a type of exfoliating acid. I did exactly as The Ordinary recommend, first applying it to the spots that I had for the first few days and then all over as it cleared my spots right up. They recommend using it morning and night and to either apply directly to the spot in question or to the whole face for an all over smooth look. Thanks to its antibacterial properties and its ability to deeply exfoliate skin to unclog pores, itâs a valuable ingredient for anyone dealing with oily skin, breakouts, or acne. The other type is AHA, or alpha hydroxy acid, and this includes ingredients such as glycolic and lactic acid. ... After use, skin may be a bit sensitive (that's the salicylic acid working) so steer clear of excessive sun exposure and be sure to wear sunscreen. Note: This product is out of stock, but is in the process of â¦ How to Use The Ordinary Salicylic Acid. Salicylic acid is a key ingredient which youâve probably seen in many cleansers and blemish treatments. The Ordinary Salicylic Acid 2% Solution $7. Shop.