BHA (Salicylic Acid)

What it is

BHA (beta hydroxy acid) is oil-soluble, unlike the water-soluble AHAs — a distinction that matters because it lets BHA travel into oil-filled pores rather than acting only on the very surface of the skin. Salicylic acid is by far the most common BHA in skincare, and is closely related to the compound in aspirin.

What it does

Because it's oil-soluble, salicylic acid can get into the pore lining, which is why it's a staple in formulations aimed at congestion and breakouts.

Who it’s for

Oily, combination, or acne-prone skin, and anyone dealing with visible congestion, blackheads, or textured pores — generally the acid family favored over AHAs for those specific concerns.

Possible benefits

• Can help address surface congestion and the look of clogged pores
• Associated with a smoother, less congested-looking complexion over time
• Often included in formulas aimed at occasional breakouts

Irritation & compatibility considerations

Salicylic acid can cause dryness, peeling, or irritation, particularly at higher percentages or with too-frequent use, and increases sun sensitivity like other exfoliating acids. It's generally not recommended alongside other strong acids or retinoids in the same routine slot, and isn't typically used on very dry or compromised skin without caution.

How it fits into a routine

Commonly used a few times a week (or as a targeted spot treatment) rather than daily for many people, at night, followed by a moisturizer. Some lower-percentage cleansers are formulated for more frequent use since rinse-off contact time is much shorter.