Unverified90% confidenceDecision RuleTime unknown
过氧化苯甲酰（BPO）浓度2.5%对炎性痘（红肿脓包）杀菌效果与5%、10%相当，但刺激性显著更低，敏感肌应从2.5%起步
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90%
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Long-term
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Unverified苯甲酰浓度并非越高越好，2.5%浓度祛痘效果与5%、10%相当但刺激性显著更低，新手和敏感肌应从2.5%开始，避免直接上5%以上导致爆皮脱屑81% similarUnverified烟酰胺浓度2%-5%可控油、淡化痘印、修护屏障，敏感肌首次使用应从2%以下建立耐受，避免直接用高浓度（10%）导致刺痛泛红76% similarUnverified浓度越高祛痘去角质越快，但刺激性、爆皮和屏障风险也越高；油痘肌可2%强效，干敏肌用1%配合保湿更稳妥，追求疗效和肤感需权衡71% similarUnverified祛痘活性成分越强(高浓度苯甲酰/水杨酸)刺激性越大且越干，油皮可承受但干敏肌应牺牲一部分祛痘力换取保湿和低刺激，优先壬二酸或低浓度配方70% similarUnverified敏感肌或炎症消退期应选含壬二酸(15-20%)或积雪草/烟酰胺的温和消炎款，抗炎且改善痘印，刺激性远低于BPO，孕期也可用壬二酸69% similar
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