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老年斑是怎麼形成的
老年斑是怎麼形成的
更新时间:2026-09-12 02:53:42

老年斑是由澱粉樣蛋白前體水解斷裂的片段聚合而成。老年斑是老年人的一種皮膚退行性變。表現為散在的色素斑片,大小不等,扁平或稍高于皮面,表面光滑,呈棕褐色。多見于暴露部位,如面部、額部、手背等。

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