当死皮或化妆品堆积物进入毛孔并堵塞毛孔,而毛孔仍在分泌正常的皮脂时,就会变成白头或黑头。白头位于你的皮肤表面以下,黑头位于表面。不同的是,在白头的情况下,毛孔仍然是封闭的;而黑头,毛孔被拉开。 http://stylecaster.com/beauty/the-difference-between-blackheads-and-sebaceous-filaments/ http://www.instyle.com/beauty/skin/difference-between-blackheads-and-whiteheads-and-how-treat-them