They are most commonly applied in a kind of skincare product like it involves serums, cleansers, and masks. One of the very common BHA that is used in skincare is salicylic acid. However, several kinds of citric acid are too supposed to be BHAs.

They are oil-soluble and infiltrate deeper into the skin pores (still serving on the outside layer of the skin). Hence, they are fancied for allotting skin problems such as acne and blackheads.