Ingredients

Salicylic Acid (BHA)

Written by Reviewed by the SYNC editorial team Published Last reviewed Editorial standards

Salicylic Acid (BHA) — an oil-soluble beta hydroxy acid that penetrates into pores to loosen dead cells and excess sebum, making it a common choice for oily and breakout-prone skin. Because it is lipophilic, it can work inside the pore lining rather than only on the surface, helping to reduce blackheads and clogged pores. It also has mild anti-inflammatory properties related to its aspirin-like structure.

Key points

  • Salicylic acid is classified as a beta hydroxy acid (BHA) and is distinct from water-soluble alpha hydroxy acids like glycolic and lactic acid.
  • Its oil solubility lets it exfoliate within sebum-filled pores, which is why it is widely used for blackheads, whiteheads, and acne-prone skin.
  • Typical over-the-counter concentrations range from about 0.5 to 2 percent in leave-on and rinse-off products.
  • It can be drying or irritating if overused, so starting a few times per week is common.
  • Daily sunscreen is recommended because chemical exfoliants can increase sun sensitivity.

Frequently asked

Is salicylic acid good for sensitive skin?

Many people with sensitive skin tolerate low concentrations because of its anti-inflammatory nature, but it can still cause dryness or stinging. Patch testing and infrequent use when starting out can help you gauge tolerance.

Can I use salicylic acid with retinol?

They can be part of the same routine but using both at full strength together may increase irritation, so many people alternate nights. Introduce one active at a time and monitor how your skin responds.

Related topics

This is a foundational entry in the SYNC Skin Encyclopedia and is expanded over time. Educational information only — not medical advice.

Encyclopedia

Further reading

This entry was written and checked against the sources below. They are published by clinical and scientific bodies, they are listed most readable first, and each one opens in a new tab. They are background for the whole entry rather than footnotes to individual sentences.

  1. Salicylic acid DermNet NZ Clinical guidance dermnetnz.org
  2. Keratolytic agents DermNet NZ Clinical guidance dermnetnz.org
  3. Salicylic acid as a peeling agent: a comprehensive review PubMed Central Peer-reviewed, open access pmc.ncbi.nlm.nih.gov
  4. Applications of hydroxy acids: classification, mechanisms, and photoactivity PubMed Central Peer-reviewed, open access pmc.ncbi.nlm.nih.gov
  5. A review of toxicity from topical salicylic acid preparations PubMed Peer-reviewed (abstract) pubmed.ncbi.nlm.nih.gov
  6. Efficacy and Consumer Perception of Topical Over-the-Counter Regimens Involving Beta-Hydroxy Acid for Acne Vulgaris PubMed Peer-reviewed (abstract) pubmed.ncbi.nlm.nih.gov

SYNC does not publish medical advice. Nothing here replaces a consultation with a doctor or a pharmacist about your own skin.