BHA Exfoliants

For leave-on products, 0.5% to 2% is the effective and well-tolerated range. At 0.5 to 1%, it works well for daily use and mild congestion. At 2%, it is most effective for active breakouts and blackheads but may be drying for some. Wash-off products can contain higher concentrations because contact time is brief.

The key difference is solubility. AHAs are water-soluble and work on the skin's surface. BHA (salicylic acid) is oil-soluble, which allows it to penetrate through sebum and inside the pore. This makes BHA far more effective for oily skin, clogged pores, and acne, while AHAs are better suited to dry skin, surface texture, and pigmentation.

Some people tolerate daily use well, particularly with lower-concentration (0.5%) or wash-off formulations. However, it is best to start at 2 to 3 times per week and monitor how the skin responds. Signs of over-use include persistent dryness, flakiness, redness, or a feeling of tightness.

Low concentrations in rinse-off products (such as cleansers) are generally considered low risk. Leave-on products at higher concentrations are typically avoided as a precaution during pregnancy. Always check with a GP or dermatologist if you are pregnant or trying to conceive.

Yes. Salicylic acid is effective for back, chest, and shoulder acne. Body washes containing 2% salicylic acid are a practical and well-tolerated option. Leave-on serums can be applied to targeted areas but may be costly to use over larger body areas.