---
title: "Salicylic Acid — Glossary | School of Dermatology"
url: https://schoolofdermatology.com/glossary/salicylic-acid
description: "Discover salicylic acid, the oil-soluble BHA that clears pores from the inside out, its anti-inflammatory benefits, and how to use it for acne."
lang: en
---

Glossary

# Salicylic Acid

sal-ih-SIL-ik AS-id

## Definition

Salicylic acid is a beta hydroxy acid (BHA) derived from willow bark that is one of the most effective and widely used ingredients for acne-prone and oily skin. Its oil-soluble nature allows it to penetrate into the pore lining, where it dissolves the mixture of sebum and dead skin cells that cause clogged pores, blackheads, and whiteheads. Beyond its exfoliating abilities, salicylic acid has notable anti-inflammatory and mild antibacterial properties, making it effective at reducing the redness and swelling associated with breakouts. It is available in cleansers, toners, serums, spot treatments, and leave-on products at concentrations of 0.5% to 2%. Higher concentrations (up to 30%) are used in professional chemical peels. Salicylic acid is generally well-tolerated but can cause dryness if overused. It is suitable for acne-prone, oily, and combination skin types and can be used on both face and body acne.

## Related Terms

BHA (Beta Hydroxy Acid): https://schoolofdermatology.com/glossary/bha-beta-hydroxy-acid
Chemical Exfoliant: https://schoolofdermatology.com/glossary/chemical-exfoliant
Comedone: https://schoolofdermatology.com/glossary/comedone
Sebum: https://schoolofdermatology.com/glossary/sebum

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