How to use them
The rule for using BHAs (as well as AHAs) is to go gradually: start with a maximum of three times a week, then only increase usage if your skin tolerates it and responds well. And don’t overdo it with exfoliating products!! Choose only one for your skincare routine to avoid damage.
Finally, keep in mind that the main contraindication to using cosmetics containing salicylic acid is a known allergy to salicylates (including acetylsalicylic acid). If you are allergic to aspirin, do not use these products!
Hydroxy Acids Compared
AHA vs BHA
AHAs are short-chain hydroxy acids that act on the outermost layer of the skin, stimulating cell turnover and improving skin elasticity. Thanks to their properties, AHAs are often used to treat dry, sun-damaged or skin with dark spots.
BHAs , on the other hand, are long-chain hydroxy acids that act deeply, penetrating pores and removing excess sebum and dead skin cells. Thanks to the benefits they provide, BHAs (mainly salicylic acid) are used to treat oily, acne-prone or enlarged pore skin.
If a cosmetic product is formulated with both of these types of acids, it will deliver a deeper, more beneficial exfoliation for the skin. Always remember to follow the correct product application instructions!