2011年,拿三十位移除脂漏性老化(老人斑)志願者的傷口來實驗,在每個受試者身上移除兩塊類似的老人斑,一個傷口擦抗生素藥膏( polymyxin B sulfate+bacitracin),另一個擦凡士林,採用雙盲的方式來進行。結果兩者癒合的狀況完全一樣,但是有些擦抗生素的傷口又出現了接觸性皮膚炎。這次又是凡士林完勝。(發表於美國皮膚科醫學會期刊)
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