— § 01
What salicylic acid actually is.
Salicylic acid is a beta-hydroxy acid derived historically from willow bark. The single methyl-group difference from a typical AHA changes everything: it is lipophilic, which lets it dissolve into sebum and follicular debris rather than skating across the corneocyte surface. That is why it works inside the pore and most AHAs do not.
It is also a salicylate, structurally adjacent to aspirin, with measurable anti-inflammatory activity. The ingredient calms the redness around a comedone while it dismantles the comedone itself — a combination most acne actives cannot claim.