Glossary
A class of oil-soluble chemical exfoliants that can penetrate into pores to dissolve sebum and dead skin cells from within. The most common BHA in skincare is salicylic acid, derived from willow bark. Unlike water-soluble AHAs that work on the skin's surface, BHAs are lipophilic, meaning they can cut through oily buildup inside pores.
The fundamental difference between BHA and AHA is solubility. AHAs (like glycolic acid and lactic acid) are water-soluble, so they work on the skin's surface to dissolve dead cells and improve texture. BHAs are oil-soluble, allowing them to penetrate the oil inside pores and exfoliate from within. This makes BHAs particularly effective for oily, acne-prone, and congested skin.
Salicylic acid, the primary BHA used in skincare, also has natural anti-inflammatory properties. This dual action of exfoliation plus inflammation reduction makes it especially useful for treating acne. It unclogs pores while simultaneously calming the redness and swelling associated with breakouts.
Salicylic acid has natural origins: it is derived from the bark of willow trees (Salix species), which indigenous peoples have used for pain relief and healing for thousands of years. In modern skincare, it is available in concentrations ranging from 0.5 to 2 percent for over-the-counter products.
While BHAs are effective for specific skin concerns, they are not needed in every skincare routine. For people without acne or chronic congestion, gentle exfoliation through natural ingredients like honey (which contains mild fruit acids) and regular use of moisturizing products with beeswax may provide sufficient skin renewal without the potential irritation of concentrated chemical exfoliants.
For most people, 0.5 to 2 percent salicylic acid is effective. Start with the lowest concentration and increase only if your skin tolerates it well. Higher concentrations are available by prescription for more severe acne.
Most people can use BHA once daily, typically in the evening. If you experience dryness or irritation, reducing to every other day or two to three times per week is recommended. Always use sunscreen when using any chemical exfoliant, as they can increase sun sensitivity.
BHA is generally better for active acne because it penetrates into pores to dissolve the oil and dead skin that cause breakouts. AHAs are better for surface texture issues, hyperpigmentation, and anti-aging. Many people with acne-prone skin benefit from using both, alternating between them.
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