BPO
One of the most effective OTC acne treatments. An oxidising agent that directly kills C. acnes bacteria by releasing free radical oxygen — crucially, without risk of antibiotic resistance. At 2.5%, as effective as 5–10% but less irritating. Also comedolytic and mildly exfoliating. Bleaches fabric — use white towels.
2.5–5% gel or wash PM. Start with wash-off to assess tolerance before leave-on. Use with ceramide-rich moisturiser.
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