Salicylic acid (1–2% BHA) is the most common OTC-monograph active for body acne. Supporting ingredients include niacinamide (2–5%) to calm post-inflammatory redness, zinc PCA to regulate sebum, and AHAs like glycolic acid for cell turnover. A qualified cosmetic chemist will balance efficacy, pH stability (3.0–4.0 for BHA), and skin tolerance across a large surface area.
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